dahuman on 28 May 2009
Single Player: Half-Life 2 PC or, even though it's more action adventure, Prime 3 because of the control scheme. Online Play: TF2 PC then L4D PC so far, nothing even comes close.
Overall best for me(counting SP and MP): Quake 1 followed by Half Life 1, both PC versions, best Mod communities I have ever experienced even to this day(outside of the Doom ones) making the replay values endless back in the days no matter SP or MP.
edit: I also picked HL2 PC because you can do this on PC, Fakefactory ftw.
