As of Dec 21, 2011. A little outdated but then again not much released for PS3 and 360 in January.
This is how the 360 camps rolls. No biased filters. No screening. Just EVERYTHING.
Library comparison > Exclusive comparison. Truth is a real eye opener.
360
AAA (90+) = 43
AA (80-89) = 254
A (70-79) = 375
PS3
AAA (90+) = 39
AA (80-89) = 229
A (70-79) = 273