Jess Franco's "Killer Barbys" is to the band The Killer Barbies what Aki Kaurismäki's "Leningrad Cowboys go to America" was to the Leningrad Cowboys. Both are movies starring an existing band and both are typical products of the directors. Kaurismäki is known for his deadpan black humor presented in films totally weirding you out and "Leningrad Cowboys go to America" is a weird and funny tale of the Leningrad Cowboys going to America. Franco is known for erotic horror movies and "Killer Barbys" is a mix of horny rockers and cannibalists.
But there's more. Kaurismäki made a sequel, "Leningrad Cowboys Meet Moses", an attempt to make the worst movie ever. To a certain degree he succeeds in doing so. Franco's "Killer Barbys" doesn't try to do so, but it's difficult not to see how many horror cliches you can see in this film: at night you hear the sound of wearwolves, it's often twelve o'clock, there's cannibalism, there are some dwarves, most of the rockers constantly want sex, a semi-naked girl is being chased in the woods, there's lot of blood and someone even ends up being crushed. How much gore can you get into one movie?
But movies like "Killer Barbys" and "Leningrad Cowboys" never meant to be original. They are mainly there to let you know the band exists. And if anything they are much more enjoyable than your average rockumentary. And even though Franco made lots of no-budget movies where anyone can see through the special effects, I suspect him here of making the effects as bad as possible (if you can't see that the dead bodies are dummies, you desperately need to get your eyes checked.)
It is true that Franco could have tried harder and that the movie could have been better, but it's common knowledge that Franco's best movies can't be found in the nineties. Most of those movies are even badly acted, so it's very ironic to realise that two rockers act better than Franco's cast of regulars (Lina Romay, Linnea Quigley, ...). "Killer Barbys" is the only decent movie Franco recently made, so if you want to see some of his later work, this is the best choice you can make. As long as you remember it's a Frankenstein experiment of combining gore and rockumentaries.
By the way "Love Killer" is a nice song.