Vamp is a curious lost little lamb from the 1980's, all lit in bizarre green and purple tones and featuring all manner of Grace Jones wiggling around like a monster. It's a fun ride, cleverly done and not entirely unoriginal, with terrific acting talent and a loopy sense of humour pitched somewhere between After Hours and a sideways college comedy. Another aspect I appreciated was how each vampire had a personality, and they weren't always one hundred percent proud to be vampires. They're very aware that in a lot of ways they're perfectly lame. Fairly cool stuff, especially in the confrontation between a character who "turns" and the protagonist.
On the other hand, the last half lacks the zip and zap of the first and some characters seemed a little undernourished. The geek who owns the car seemed a little extraneous towards the end, and the albino gang, while sort of awesome, didn't really belong.
But either way. If you're interested in an offbeat 80's vampire movie or just seeing Grace Jones scare the s**t out of you with her face, by all means rent Vamp. You will become a much wiser person as a result and your parents will no longer hate you.