I saw this film last night and thought it was amazing. Because it's from the Sam Rami, who created the masterpiece that is the Evil Dead Trillogy, it obviously doesn't take it's self too seriously like other horror films such as Creap and The Hills Have Eyes. Because of this you get some really brilliant funny parts. This isn't to say that the film isn't scary as fuck, with in the first 5 miniutes of the film you're left schocken up pretty badly and then you realise there's another hour and a half of it left.
I highly recommend you go see this film and make sure you're bladder is dry as a bone before you enter the cinema. Last year I saw alot of horror films with my old housemates, we went through quite a few of the generic popcorn horror films such as Creap and I have to say this film is a lot more scary than them. If you're a fan of the Evil Dead series, or like the type of horror films such as Teeth then this is a film you can not miss. I recommed you see it in the cinema as soon as you can while it's still selling out screens because the atmospher in there is so great.