Why is that Metacritic scores more reviews for Sony games than Multiplat?

[Dgc1808]

WiiStation360 said:

massiso said:

I don't get it, if I look @ some sony games they have more reviews accounted for than multi platform games, and some are under scored...

COD6 67 reviews
COD6 99 reviews (360)
KZ2  91 reviews

GTA4 64 reviews
GTA4 86 reviews (360)
Uncharted 2 104 reviews

Bioshock 51 reviews
Bioshock 88 Reviews (360)
inFamous 98 reviews

Rockband 35 reviews (360)
Rockband 88 reviews
Singstar 48 reviews

More sites reviewed the 360 version of the game, and did not bother to review/score a second version that was most likely identical.

/THREAD