I wouldnt listen to Maxwell cuz Res2's controls are customizable and L4D's controls are horrible, plus not moving when a zombie touches you sucks.
Im very interested in VC myself and having played the demo I cant wait to get the full version. Honestly Res2 has amazing multiplayer, but fallout 3 hasnt been an addicting game, good but not as addicting as other games out there.
go VC and Res2!