Yeah WTF, this is actually probably the coolest thing I've ever heard. His bullets are too slow, so he has to murder zombies with a crowbar at lightspeed or some shit.
I would go with about twelve minutes too long. Especially the credits. Internet videos don't need credits listing a bunch of people without real names.
Sorry but I have to say I liked the over-the-top action sequence. Throwing things around in Garry's Mod is just funny looking to me because I'm easily amused.