Back to the crap at hand. Metal Mayhem was very bad cheese. For just about all occasions it deserves a DS of 1, but it might be ok with a large group of people who enjoy making fun of movies and who enjoy watching cheesy kung-fu, on the off chance that they suggest a movie that you haven't seen of vice versa. It's the kind of movie that will probably get comments like: "oh, they did this much better in ____", or "this is a blatant rip off of _______" etc...
If it was possible, I'd recommend this movie for linging the bottom of a birdcage of maybe a feret cage.