This test is possible because the Coollector ratings convert perfectly into Criticker ratings (and vice-versa):

100  excellent+
95   excellent
90   excellent-
85   very good+
80   very good
75   very good-
70   good+
65   good
60   good-
55   neutral+
50   neutral
45   neutral-
40   bad+
35   bad
30   bad-
25   very bad+
20   very bad
15   very bad-
10   awful+
5    awful
0    awful-


I've picked some Criticker users at random and I've quickly found one who used the exact same rating scale as above.

It was the user named ejcon: https://www.criticker.com/rankings/ejcon/

Then with a brand new account on Criticker and a brand new coollection on Coollector, I've applied the ejcon's ratings for the 5 first movies of each rating levels:

100
Die Hard
The Godfather
The Lion King
Pulp Fiction
The Shawshank Redemption

95
Adaptation.
Anchorman: The Legend of Ron Burg
Back to the Future
Eternal Sunshine of the Spotless Mind
The Godfather: Part II

90
3:10 to Yuma (2007)
The 40-Year-Old Virgin
Alien
American History X
American Psycho

85
300
Adventureland
American Pie
The Assassination of Jesse James
The Avengers

80
127 Hours
21 Jump Street
48 Hrs.
50/50
8 Mile

75
101 Dalmatians 
Ace Ventura: When Nature Calls
Airplane!
Aladdin: The Return of Jafar
The Amazing Spider-Man

70
50 First Dates
Along Came Polly
Alpha Dog
American Gangster
American Reunion

65
101 Dalmatians
Alice in Wonderland
Animal House
Austin Powers in Goldmember
Avatar

60
30 Minutes or Less
Ali G Indahouse
Big Fat Liar
Couples Retreat
Crossroads

55
Envy)
Fantastic Four: Rise of the Silver Surfer
Freaky Friday
Fright Night
Hancock


When came the bad movies, I've only rated one per level. This was mostly to show to the Criticker system that I'm using a scale from 0 to 100:

50
Alice in Wonderland

45
Analyze That

40
2012

35
Batman Returns

30
10,000 B.C.

25
Chicken Little

20
88 Minutes

15
Catwoman

10
Deuce Bigalow: European Gigolo

5
Date Movie


***********************

Because the user ejcon have rated much more movies, I can now compare the real ratings of ejcon with the predictions of Coollector and Criticker. Here are the results, they express the difference between ejcon's ratings and the predictions (the smallest the difference, the better).

For example the first result is:
Goodfellas   5 - 0
It means that Criticker made an error of 5, predicting 95 instead of 100, while Coollector made an error of 0, correctly predicting 100.


Goodfellas   5 - 0
Monty Python and the Holy Grail 6 - 55
Reservoir Dogs 9 - 0
The Silence of the Lambs 0 - 0
Borat 15 - 10
Bronson 10 - 15
The Dark Knight 10 - 10
The Departed 5 - 5
Dumb and Dumber 30 - 10
Finding Nemo 10 - 0
The Green Mile 2 - 5
Hercules 25 - 10
In Bruges 4 - 5
Inglourious Basterds 5 - 5
Misery 10 - 5
The Outsiders 15 - 10
Red Dragon 20 - 10
Scarface 5 - 5
Shaun of the Dead 10 - 5
Tarzan 20 - 10
To Kill a Mockingbird 1 - 5
Up 10 - 0
The Usual Suspects 10 - 5
Back to the Future 10 - 15
Drive 5 - 0
The Fox and the Hound 10- 5
Glengarry Glen Ross 5 - 0
The Hangover 10 - 0
Lady and the Tramp 15 - 10
Office Space 2 - 0
Rango 10 - 10
Seven Psychopaths 10 - 10
Shrek 5 - 5
Taxi Driver 15 - 10
WALL·E 1 - 5
Ace Ventura: Pet Detective 10 - 0
Aladdin 5 - 10
American Pie 2 25 - 10
Austin Powers: The Spy Who Shagged Me 21 - 15
Austin Powers: International Man of Mystery 10 - 5
A Bug's Life 5 - 0
Cast Away 5 - 5
Dances with Wolves 6 - 5
Ferris Bueller's Day Off 0 - 0
The Godfather: Part III 5 - 5
Harold and Kumar Go to White Castle 10 - 0
Idiocracy 10 - 40
Jurassic Park 5 - 10
Men in Black 10 - 0
Mulan 10 - 0
The Next Three Days 10 - 0
O Brother, Where Art Thou 9 - 5
Primal Fear 0 - 5
Shrek 2 10 - 5
Superbad 5 - 0
Wayne's World 15 - 5
The Wizard of Oz 0 - 5
Antz 10 - 0
The AristoCats 0 - 0
Billy Madison 10 - 5
Bowling for Columbine 5 - 10
Charlie and the Chocolate Factory 10 - 5
Crash 10 - 0
Hannibal 10 - 0
I, Robot 10 - 5
The Jungle Book 5 - 5
Looper 0 - 10
The Lord of the Rings: The Fellowship of the Ring 20 - 20
The Lord of the Rings: The Two Towers 14 - 20
The Lord of the Rings: The Return of the King 12 - 20
Madagascar 10 - 0
Pocahontas 5 - 5
Robin Hood 5 - 5
The Simpsons Movie 10 - 5


Total: 667 - 500
(Criticker 667, Coollector 500)



Biggest errors:

Hercules 25 - 10
Dumb and Dumber 30 - 10
Idiocracy 10 - 40
Monty Python and the Holy Grail 6 - 55

Coollector seriously missed with the last 2 movies and was heavily penalized for it.



***************************

Then I've followed the test by adding more ratings to have more predictions


100
The Social Network

95
Goodfellas
Groundhog Day
The Master
Memento
Monty Python and the Holy Grail

90
Batman Beyond: Return of the Joker
Batman: Mask of the Phantasm
Beauty and the Beast
Borat
Brokeback Mountain

85
Back to the Future Part II
Bambi
Batman Begins
Beverly Hills Cop
Big

80
Ace Ventura: Pet Detective
Aladdin
All Dogs Go to Heaven
American Beauty
American Pie 2

75
Antz
The AristoCats
As Good As It Gets
Baseketball
Batman

70
Analyze This
Anger Management
Back to the Future Part III
Bad Boys
Batman: Gotham Knight

65
Batman Forever
Beethoven
The Bucket List
Cars
The Chronicles of Narnia: The Lion, the Witch and the Wardrobe

60
Daredevil
Date Night
Disturbia
Due Date
Earth Girls Are Easy

55
Harry Potter and the Deathly Hallows: Part 1
Harry Potter and the Goblet of Fire
Harry Potter and the Half-Blood Prince
Harry Potter and the Order of the Phoenix
Holy Man


**************

Results

Reservoir Dogs 5 - 0
Seven 0 - 0
The Silence of the Lambs 0 - 0
South Park: Bigger, Longer, and Uncut 0 - 10
Bronson 8 - 15
The Dark Knight 5 - 10
The Departed 5 - 5
Dumb and Dumber 15 - 10
Elf 25 - 15
Finding Nemo 0 - 5
Forgetting Sarah Marshall 10 - 15
Forrest Gump 0 - 0
Ghostbusters 5 - 10
The Green Mile 5 - 5
Hercules 25 - 10
In Bruges 5 - 5
Inglourious Basterds 5 - 5
Knocked Up 15 - 15
Life of Brian 5 - 5
Man on the Moon 7 - 10
Misery 10 - 5
Old School 15 - 15
The Outsiders 15 - 10
Red Dragon 20 - 10
Scarface 6 - 5
Shaun of the Dead 6 - 5
Silver Linings Playbook 15 - 5
Tarzan 20 - 10
Titanic 25 - 10
To Kill a Mockingbird 0 - 5
Toy Story 5 - 5
Toy Story 3 0 - 0
The Truman Show 5 - 5
Up 0 - 0
The Usual Suspects 0 - 5
The Big Lebowski 15 - 0
The Brave Little Toaster 10 - 5
The Breakfast Club 10 - 5
Bridesmaids 15 - 10
Dodgeball 20 - 10
Drive 10 - 0
The Fox and the Hound 10 - 5
Glengarry Glen Ross 10 - 0
Good Morning, Vietnam 5 - 5
The Goonies 10 - 5
The Hangover 3 - 0
Hot Fuzz 2 - 15
How to Train Your Dragon 10 - 0
The Hunchback of Notre Dame 15 - 5
The Incredibles 2 - 0
Iron Man 5 - 0
The Karate Kid 10 - 10
Kung Fu Panda 10 - 0
Kung Fu Panda 2 10 - 5
Lady and the Tramp 10 - 5
Lion King 1˝ 25 - 10
The Lion King II: Simba's Pride 25 - 10
Moneyball 1 - 0
Office Space 4 - 0
Planes, Trains and Automobiles 1 - 5
Punch-Drunk Love 5 - 5
Rango 0 - 5
Ratatouille 10 - 0
The Rugrats Movie 30 - 0
Seven Psychopaths 10 - 5
Shrek 2 - 0
Spider-Man 2 10 - 10
Stand by Me 5 - 0
Taxi Driver 15 - 10
Vacation 10 - 5
WALL·E 10 - 5
Wedding Crashers 15 - 10
X2: X-Men United 5 - 10
Zombieland 4 - 5
Zoolander 15 - 10
Austin Powers: The Spy Who Shagged Me 10 - 5
Austin Powers: International Man of Mystery 5 - 5
Be Kind Rewind 5 - 15
A Bug's Life 10 - 0
Cast Away 5 - 0
Christmas Vacation 10 - 0
Dances with Wolves 0 - 5
Die Hard: With a Vengeance 5 - 0
Enchanted 10 - 5
Ferris Bueller's Day Off  4 - 5
The Fighter 5 - 5
Ghost 15 - 5
Gladiator 10 - 5
The Godfather: Part III 5 - 5
Harold and Kumar Go to White Castle 10 - 0
Homeward Bound 10 - 5
I Love You, Man 4 - 5
Idiocracy 5 - 30
It's a Wonderful Life 10 - 10
Jaws 1 - 5
Jurassic Park 4 - 5
Kingdom of Heaven 10 - 5
The Land Before Time 10 - 0
The Little Mermaid 5 - 0
Men in Black 5 - 0
Monsters, Inc 3 - 5
Mulan 0 - 0
My Girl 10 - 5
Napoleon Dynamite 10 - 5
The Next Three Days 5 - 0
Not Another Teen Movie 15 - 15
The Notebook 10 - 0
O Brother, Where Art Thou 10 - 5
Pineapple Express 10 - 0
Primal Fear 1 - 5
The Royal Tenenbaums 1 - 0
Safety Not Guaranteed 5 - 5
Scary Movie 15 - 10
Shrek 2 5 - 5
Something's Gotta Give 10 - 5
Spaceballs 5 - 0
Spider-Man 5 - 0
Stranger Than Fiction 0 - 0
Superbad 10 - 0
Superman II 5 - 5
Superman: The Movie 5 - 0
There's Something About Mary 10 - 0
This Is 40 15 - 15
Tommy Boy 10 - 5
Toy Story 2 10 - 5
Wayne's World 15 - 5
When Harry Met Sally 5 - 0
The Wizard of Oz 0 - 10
X-Men: First Class 4 - 0
You've Got Mail 10 - 10
Billy Madison 5 - 5
Bowling for Columbine 5 - 10
Brother Bear 10 - 0
Bruce Almighty 10 - 0
Casper 10 - 10
Charlie and the Chocolate Factory 5 - 0
Click 15 - 10
Corpse Bride 0 - 5
Crash 5 - 10
Crazy, Stupid, Love 0 - 5
The Da Vinci Code 10 - 20
Dan in Real Life 5 - 0
Easy A 5 - 0
Edward Scissorhands 8 - 10
Flubber 20 - 20
Frosty the Snowman 5 - 5
Funny Games 5 - 10
A Goofy Movie 5 - 5
Hall Pass 20 - 20
Hannibal 10 - 5
Happy Gilmore 10 - 5
The Hitchhiker's Guide to the Galaxy 5 - 0
Honey, I Shrunk the Kids 5 - 0
Horrible Bosses 10 - 0
The Hunger Games 0 - 0
I, Robot 5 - 5
The Imaginarium of Doctor Parnassus 0 - 5
Independence Day 10 - 0
Into the Wild 20 - 10
The Jungle Book 0 - 5
King Kong 0 - 5
Little Miss Sunshine 15 - 10
Looper 7 - 10
The Lord of the Rings: The Fellowship of the Ring 15 - 20
The Lord of the Rings: The Return of the King 15 - 20
The Lord of the Rings: The Two Towers 15 - 20
Love and Other Drugs 15 - 10
Madagascar 10 - 0
The Mask 5 - 5
Mrs. Doubtfire 5 - 0
National Treasure 5 - 15
Oliver & Company 10 - 0
The Perks of Being a Wallflower 0 - 0


Total: 1408 - 975
(Criticker 1408, Coollector 975)

*******************

Conclusions:
------------

We can say that the two systems gave great results, as very often they are spot on or only off by a little. We should keep in mind that we've used an extremely accurate rating scale with 21 different levels. There's not much of a difference between a 65 and a 70, so predicting a 65 instead of a 70 is an almost neglictable error. We can also notice that on several occasions the user's rating has surprised both Coollector and Criticker. Maybe it's because they both didn't have enough data yet to fully understand the user's taste, or maybe the user's rating was really surprising, contradicting, and unpredictable. By the end of the test, the predictions of Coollector appeared to be slightly more accurate, but not by much. Criticker made roughly 50% more errors, but 50% of a little, that's still not much.