A Good Multiplayer Game

WiC, BioShock, Quake Warthusaha

Bioshock doesn't have multiplayer.

If you don't have it already get Battlefield 2

for RTS i would say Go "Dawn of War" or "Company of Heroes". World in Conflict is a really good game, but IMO i feel the other two are more fun

For FPS i would say "Battlefield 2" I'm a high rank on both BF2 and BF2142, BF2 is a much better game. Quake Wars is fun, although because its so team based.. to many times you are paired up with idiots and that ruins your gaming experience.

For RTS CoH or WiC. My favourite RTSs ever. WiC is more casual and easier to figure out, but still loads of fun and beautiful graphics. CoH is much deeper and more complicated, but a real blast when you get into it. Plus, CoH is only $30 and the expansion (which is standalone, but you only get the two new armies which IMO are harder to play) is $40.

For FPS BF2 (Still quite a few people playing, including myself), but not 2142. Far fewer players and it's not as good IMO, though the unlock system was genius. I hated the Quake Wars demo, but if you're interested you could go ahead and try it for yourself.

OR you could save your money for any of the several fantastic realeases coming this fall/winter. CoD4 is at the top of my list (I'll be broke after CoHOF though, so probably Christmas)

WiC is good fun MP

MoH airborn is fun game too

counter strike: source