Terrible...
It wasn't scary and it wasn't funny. And the acting was pretty shoddy, too.
Filming a horror film from the perspective of the killer is a terrible idea- like filming a romantic movie but just focusing the camera on the characters' shoes. Just because you have a different idea doesn't mean you should do it- maybe the reason why other people aren't doing it is because it's a crappy idea.
I have to go watch a Nightmare on Elm Street film to try to cleanse myself of this one.