have the full game, really, this game is FUN!
the campaigns are not too long, so if you wanna take a brake from work to kill some zombies, this is it.
if you play in 'Advance' mode you won't find it that easy, i haven't even tried 'Expert' yet.
yes, 5 campaigns is not a lot, but let's not forget that you have them in Single Player mode, in Multi and the cool VS mode.
achievements is always cool thanks to steam.
and it's Valve, you can expect more free content in future. or just for $0.98 :)
