As has already been mentioned people aren't complaining so much about the score as they are about what they see as bias on the part of gametrailers. I'm not necessarily saying that they are biased but you can certainly make a case for it:
GT Metacritic GT Metacritic
Bioshock 95 96 -1 Uncharted 2 93 97 -4
Halo 3 98 94 +4 Little Big Planet 94 95 -1
Gears of War 91 94 -3 MGS4 93 94 -1
Gears of War 2 95 93 +2 Killzone 2 92 91 +1
Mass Effect 96 91 +5 MLB The Show 88 90 -2
GTA 4 Lost & D 92 90 +2 Ratchet and Clank Tod 90 89 +1
Forza 2 91 90 +1 Demons Souls 89 90 -1
+10 -7
