This is not an overly serious movie. If you're in the mood for something silly a la a poor-man's Mel Brooks flick, this is one that is done by a tight soul group called Bloodstone. I gave it a 7.
In addition to some original music, the group does good covers of a striking variety of song genres, and I think this is a particularly good quality of the film and music. Examples from the 40s-50s-60s: As Time Goes By (very good version!), Yackety-Yack, Money (yeah the one that the Beatles covered).
These guys looked to me like they had a very good time making this movie, and that makes the movie better.
This movie is not meant to be the experience of a century. It's just a deliberately ridiculous musical romp with some terrific music, some ok choreography and a villain or two and that's that. I liked it because of the music, the performances of individual group members, the soundtrack ages quite well in my collection and in the end it's an B-movie plot. On this last point, I'd say that, if you're in the mood for a silly musical, the plot-story is weak but ok, with a lot of referential characters (impersonated characters such as of Bogart, A Legosi-ish Vampire, Nelson Eddy+Jeanette MacDonald, I think maybe a James Dean-type, etc.)
The group members are sufficiently ok in acting that one can like them.
The DVD does not stand in well as a good-audiophile soundtrack (unless there's something I don't quite get about how to use a video DVD to play back sound). Since the music is what I wanted to re-listen to many times, I had to get the CD. But there's nothing wrong with the film. I'd have to give it higher than a 5, the average at the time of this writing, if only because an enjoyable musical is so hard to find.
I had to wait about 20 years for them to come out with both the movie and the CD. Something has always been wrong with Bloodstone's music and film distribution. I saw this film in the 70's and here it is 2002 and finally it's available on VHS or DVD? What about the soundtrack? Why wasn't that available with other Bloodstone albums, until now? What the heck is up with that? This isn't the first time I've run into that trouble finding Bloodstone's work. There was also a problem with getting all the songs from the vinyl of Natural High on to the CD. To my knowledge, that hasn't been fixed.