Zombie Nightmare is, indeed, a nightmare but not in a good way. Heinous acting. Stereotypical characters. The worst Italian and Jamaican/Haitian accents I've ever heard in a film. No wonder this movie was the target of Mystery Science Theater 3000. In fact, I recommend that if you dare to watch this film watch the MST3K version so at least you can laugh at this "so bad, it's bad" movie.
The basic story revolves around a mother whose husband dies early in the film. Then, years later, her son is killed in a hit and run car accident. Mama isn't going down without a fight so she enlists the neighborhood voodoo priestess (Doesn't everybody have one?) to bring her son back to life so he can seek his revenge. The scenes with the priestess are laugh-out-loud ridiculous and the make-up on the zombie son looks like something you're likely to see in your neighborhood on Halloween night. I know they had a limited budget but, even I do better work than this! The rest of the film involves zombie-boy bashing in everyone's skulls in with a baseball bat until everyone who was in the car that hit him is dead. What makes it worse is that there is no gore in these scenes so the deaths have no emotional or visceral impact whatsoever.
The only bright spot in Zombie Nightmare are the songs from Motörhead and Girlschool. [Why the UK band Girlschool never got noticed in the US is a mystery to me.] The rest is the worst of what hair metal has to offer from bands you've never read of. [Virgin Steele, anyone?] Even the promise of Adam "Batman" West isn't enough of a draw since he doesn't appear in the film until about 45 minutes into it and then gives a lackluster performance.
So if you're looking for zombies of the flesh-eating type, look elsewhere. If you're looking for horror that's scary, look elsewhere. If you're looking for a movie that has been made wit at least a minimum of competence, look elsewhere. You've been warned!
For more info check out the film's entry in IMDB.