Great question, easy answer, Bad Company 2. why? well in Modern warfare you do one thing. shoot a gun. no vehicles. smaller maps.

in Bad Company 2 the question is what don't you do? it does everything. hopefully they will add co-op to it, no word on that yet. all you have to do is watch a

few gameplay videos of the PC version and that will help you decide. its obvious there is way more to do.

I dont get why people who like playing online keep saying playing with bots is pointless, what do u think you are playing against in a single player game,Humans? lol. play unreal 3 in TDM with bots on adept difficulty, then press V to give the command to a team mate bot to watch your back, then tell me what you think of bots again after that. AI has to evlolve as well as the games, Play Far Cry 2 single player game, its basically a 50 sq mile world filled with the most intelligent bots in fps right now. More games should have it, yes its cost more, but good games dont come cheap.