mw3 is great game. but survival kind of sucks since you can only have one extra teammate.

killing floor is cheap, but fun, more so with some fun team mates, and if your internet goes down, you can still play solo..Its just great fun for the money, which was not much...hahah...getting to level six on everything will take awhile so that is what kept me going for going on two years I think...hahha