Not great.
The controls are unresponsive, since its hard to move your fist with enough force with a mouse. Of course the WASD controls are fine if you have a functioning keyboard. Also, the attacks don't always register, resulting in my kick missing and then me having a torrent of zombies rushing me. The man needs a long arm that moves separate from the body, because if you move your hand around and around you simply lean back and forth and die. This would be better with simple button combos than using motion control via the mouse. The thing is, a mouse can't register a continuous path if it's moving as fast as it does with a gamer flailing away on the mouse pad, and so it gets choppy, causing the limbs to warp around rather than swing, effectively eliminating any firepower. Good concept though.