Melee-focused co-op action game, a lot like left 4 dead, set in warhammer fantasy universe. Fight through hordes of skaven (rat men) while completing various objectives. There is a sort of meta-game where you collect new weapons for completing missions and you can try to get the highest level weapons with good traits like lifesteal or chance to instant-kill an enemy. There are 5 distinct characters - the dwarf and the soldier can use shields or 2 handed weapons, the wizard can use magic staves that don't consume ammo unlike other ranged weapons, etc.

Does anyone play?

It's in the latest Humble Bundle, so it's dirt cheap to pick up right now.