@ Garnett
Hate to tell you but COD4 wasnt that great,it was hyped up with a GOOD multiplayer,i call it COD2 with mods,cause thats what it is...
I haven't bought that game, I opted for Warhawk instead as it provides a far more unique take on multiplayer shooting with the awesome Warhawks up in the air, I just pointed out COD4 sold much better than Crysis did. The bulk of big PC shooters will also be on the consoles, it's exclusives which will get the most out of each platform, this is far more the case for the PC (better specced) and PS3 (better specced and requires significant game engine redesign) than it is for the 360.
Luckily on the PS3 we have games like Resistance 2 and Killzone 2, which have very solid and unique online multi-player support next to good single player campaigns.
Even Crytek stated they will be going multi-platform with regard to their future FPS games. Their game engine seems well suited for PS3 adaptation (heavily multi-threaded already), I wonder what they will come up with.
Probably there's going to be Gears 2 and Halo 3 for the PC and these will be some of the biggest PC 3D shooters in the future, but those would of course be 360 ports, build around the capabilities of what the 360 can accomplish at its core, maybe a few improvements here and there combined with certainly higher potential resolutions and framerates. IMO it doesn't look very good with regard to PC exclusive shooters for the long run.