Okay folks, because I hate myself I ran the numbers.



I looked through the reviews for all PS3 and 360 exclusives and compared the Metacritic to the Polygon reviews. I don't think I missed any but it's possible.



PS3:

Last of Us

Deadly Premonition DC

God of War Ascension

Sly Cooper Thieves in Time

LBP Karting

Ni No Kuni

Ratchet & Clank Full Frontal Assault

Starhawk

Guacamelee



Metacritic PS3 Average: 78.11

Polygon PS3 Average: 68.89

Difference: -9.22

Conclusion: Polygon rates PS3 exclusives lower than the average critic by 9.22 points on a 100 point scale.



360:

Gears of War Judgment

Halo 4

Witcher 2

Dance Central 3

Forza Horizon

Fable Journey

Steel Battalion

Kinect Star Wars



Metacritic 360 Average: 72.38

Polygon 360 Average: 61.88

Difference: -10.5

Conclusion: Polygon rates 360 games 10.5 points lower than the average critic on a 100 point scale.



Remove Kinect games from the equation and the Polygon 360 average is -8.5, which may indicate a slightly less negative bias toward 360 exclusives. However, this is based on only 4 scores, and that makes the estimated average a lot less precise. I would guess that a statistical test would reveal no significant difference between 8.5 and 9.2 based on this small number of observations.



Conclusion: Polygon scores both PS3 and 360 games lower than the Metacritic average. They score 360 games slightly lower, though probably not significantly so. In other words, NOT TEH BIAS.



Use this info however you see fit.