I would of have picked COD4 but I choose TF2: Don't get me wrong, COD4 MP's one of the best in the business but at the same time, despite having fun, it does have some major balance issues at times (Yeah, I'm talking about the PC version where you can get 32+ players on Shipment, it's fun for pure carnage but IW really didn't seem to get ALL the corners straight); TF2 never once got me in some rage like when getting killed randomly by grenades (Also no grenades in TF2) or fagots who abuse the Grenade Launcher in COD4. Some people though think the maps are a bit blah but who cares, it was surely hell balanced and had the best laugh in my gaming life with the comments the characters made in a long, long time. It's the one mainstream game that truly makes you feel like you are part of a team.