Game is horribly broken, my friend died for no reason, weapon models disappear out of thin air. The hit detection seems to be WAY off, either that or the damage counters are screwed. I hit a zombie like five times with a sledgehammer and nothing. Very frustrating considering it isn't forgiving difficulty wise.
There is seemingly no balance in the weapons either (at least from the starting selection)... the chainsaw is like 1000x better than anything else because it guarantees damage.
No offense to the devs but coming from L4D this is unplayable to me