I just finished Prototype's storyline, twas good, but not really satisfying. Now I'm stuck in the city with little to nothing to do, except for events, and freeroaming (which is rather cool on itself).
I installed Fallout 3, but that thing feels too huge, and it sucks that I just got out of the first part, accidentally robbed a barkeeper, which caused my karma to drop. Now the barkeeper is shooting my head off with some of his friends and they're just too strong..
:sad:
I'm about to give Street Fighter IV a chance, even though I don't own a controller at the moment, so I don't know if I'll be able to do it with friends. Anyway, I'll try it out.
If you're looking for co-op then I suggest Call of Duty 5. The co-op bonus level with nazi zombies is really fun and intense~ also I believe they're about to/ (or recently did) release some new zombie levels. I might reinstall it if someone confirms this. The single player mode wasn't what I expected though.