So that's pretty much what you get here. The killer is Mad Man Murz, hence the title, and he's a hulking, brute of a man with the strength of over three men! He also has claws and hairy feet and swings an axe like there's no tomorrow.
Another plus for me was the music, which, given the inspiration to the whole thing, you won't be surprised sounds like something John Carpenter might have come up with ... and typical of films of the time, there are no explanations. Why is Murz haunting this summer camp with his axe, where are the police, and how is he seemingly getting away with all this?
Overall it's an interesting slice of 80's slasher film. Heavily influenced by other films around it, and very derivative. For a night out with beer though, it's probably a good fun film to enjoy with others.