For playstation it is very different because they have fan bases from many different genres instead of just a couple of games....ie mario zelda etc for nintendo and halo gears for x360
playstation has HEAPS
nathan
crash
kratos
jak and daxter
ratchet
etc etc
Predictions
GT5 will sell 3.2million + first week on ps3 (made 06 March 2010)
FFXIII Versus will have higher Metacritic scores than FFXIII after the first month.... Bet going on with perpride - loser changes sig for a month
KH3 will be PS3 EXCLUSIVE - willing to bet removal from vgchartz for a month