I've seen a lot of worse films to be honest, and with better known actors.
It's a slasher of epic proportions in the typical Japanese style with lots of blood and gore, and copious amounts of unhuman barbarism to people.
If you're used to things like Saw and the Hostel series of films you're probably going to like this. It's got the right amount of brutality and blood to keep any fan happy.
It's a ludicrous plot, with at times silly dialogue, but in fact it does bring a bit of tension by the clever way it's directed and filmed.
I used to be a fan of Stephen Dorff back in the day but he went off my radar for years until this film. Emile Hirsch was never a great actor, but he's definitely done better than this one. I think the standout was Grace played by Gigi Zumbado. Not a bad role and quite well played all things considered.
Buying the DVD is completely out of the question but if you want a bit of tension, with a few chuckles thrown in for good measure, this is definitely worth a look one night with a friend and a couple of beers.