First week? Okay, then the PS3 has:
MGS4: Fastest selling stealth shooter
LBP: Fastest selling 2D platformer with a focus on level creation
Uncharted: Fastest selling platformer/third person shooter hybrid (Tomb Raider isn't out just yet)
MotorStorm: Fastest selling HD offroad racer
GT5 Prologue: Fastest selling racer demo
Now, how many of those actually count? You can't deny MGS4.
EDIT: Fastest selling strategy game would go to a PC game. Of course, we are probably only talking about consoles here, but RTS never does well on consoles. Sure, Halo Wars has the magic four letters, but if Rare made Halo-Kazooie, would people buy it?
Horror will go either to the PS3 or 360 version of RE5
Fastest Racer is going to Gran Turismo 5. No other racer can touch it. GT3 was the best selling PS2 exclusive.









