looking for a good multiplayer game

hey guys, im looking for a fun/good multiplayer game for the ps3 or 360. it doesnt really matter what genre, but keep in mind that we are a bunch of guys in uni and are just looking for something fun to play in our apartment.
 
also note that i have these games already (so dont wry about suggesting these): halo 3, cod4, ufc, any sports game, lbp and any gh or rockband game. sorry if that narrows the selection any.
 
thanks in advance!

Battlefield 1943, Battlefield Bad Company.

Can't think of any offline games, but Red Faction Guerrilla is pretty fun. Plus you can unlock a giant bird to wack stuff with. That speaks for itself.

Killzone 2 is great fer multiplayer.

" Call of Duty 4: Modern Warfare "

Left 4 Dead

Street Fighter IV?

Maybe a good racing game thats not to sim-y. Something like Project Gotham Racing 4 or Burnout Revenge/ Paradise. Crash mode is always a fun time for me and some friends. Great thing is both of those games are old so you can find them from 15-30 bucks. Random Sidenote: What University are you heading off to?

 Killzone 2 ,   Battlefield 1943

I recommend Street Fighter IV.  It's a very fun game to play with other people of the same skill level.

Offline Multiplayer= 'Splosion Man
Online Multiplayer= Left 4 Dead (with friends only, the public are non-communicative dicks).

Battlefield 1943, Killzone 2 and Fat Princess. These are all games I've enjoyed.

After boycotting GoW (I don't know why I did) and playing it's multiplayer for the first time a few nights ago, I would have to reccomend it. I only played for a few hours, but it was some good. I don't have experience with it getting old, so maybe I'm not the best person to suggest it though.    
 
BlazBlue has THE best fighting game online mode I've ever played. Yes, better than SFIV.