It's a vampire comedy. Starring, co-written, and co-directed by one-half of Flight of the Conchords, Jemaine Clement. So of course it's funny. It's R-rated (MPAA: "bloody violent content, some sexual material and language.")
The idea is that it's a documentary, filmed in a reality-TV style. Except the subjects are vampires, four of them living in a unremarkable house in Wellington, New Zealand. They have the typical housemate spats: who's gonna clean up all that blood, stuff like that.
It's a funny premise, maybe a tad too thin when stretched to an hour and a half. Another theatrical-release sputterer, our second in a row. What's the deal there? Maybe it did better in New Zealand.