I don't know Metacritics very well, but when I watch the scores and see that Motorstorm Jap WITHOUT the online mode get a better score than Motorstorm WITH the online mode, I know that their ranking system is just worthless.
Furthermore, I'll add that out of the 20 "best rated PS3 games", I see 4 exclusive PS3 games (including a demo -seriously they RATED A DEMO ?- and PSN game).
On Wii, 7-8 out of the 11 best rated games are exclusive.
Can make a slight difference...







