I can stand armed zombies, after all I've always wondered why they can't retain object manipulation to some degree... I mean, it's not like the game sports vampires who suddenly sparkle instead of melting under the sunlight, right? ;)
As someone said before me, though, I didn't like the fact that rocket launcher wielding bosses hit you whenever they fire, even if they face backwards... strafe became pointless in those situations.
Otherwise, a very good game, and one I strongly recommended to my friends :)