Heard it's pretty epic, especially with the new weapons (chainsaw, pan, etc.). The new zombies look pretty neat too.
I play this game on a competitive level, and I must say that if you don't plan on playing in tourneys or what-not it's a perfect game for you. It is highly intended for pub matches and friends playing together. The game needed serious modding to make it even -------competitive and it's still annoying. I, personally, think it's extremely fun and I love playing it, with or without a good Versus team. The guns seem a bit more bulky than in L4D 1 and the animations are a bit less fluid, but once you get used to it the game is amazing. I don't care much for the characters because Zoey's gone and I loved Zoey... But Nick and Ellis are pretty cool guys. So yeah, if you're just looking for good not serious fun then it's a great game, but if you're looking for a competitive, cutthroat game then it's not for you unless you wanna stick out all the crap and deal with a half good half bad comp. game.