I played a round of it on release day (after a colossal download followed by an immediate update patch that took four hours) and it was fun! L4D quickly got boring for me and so would this game but if you like L4D you'll probably love Vermintide. Great atmosphere, looks great, very easy to get in to. There were no tips on what each class does during the selection screen but most nerds will get it: Imperial dude is a jack of all trades, Dwarf is tough but slow, the ranger shoots well, the pyro burns stuff. I had fun bashing people with my dwarf shield and deflecting Ratling shots.