How bad is it? It's a Godfrey Ho cut-and-paste film, so it's just awful.
Should you see it? No, not even if you're a Ho fan (there must be one somewhere).
Another great title hiding another Godfrey Ho travesty; Ho's been all over this blog lately, but for the uninitiated, he took already released films, added a few minutes of ninjas and re-released them with catchy titles. There's an undertaker teaching his son martial arts who have to deal with zombies and there's ninjas, but they never meet, though dialogue is intercut to make it look like characters from one film talk to those in the other. The ninjas wear bright uniforms and headbands that say "Ninja" on them so you know who they are (also used in Ho's other films). One ninja is named Ira; that's the best thing in this film.