Maybe I saw a cleaned up version, but other than a few flashes of breasts, I'm not sure what over the top nudity these other commenters are referring to.
All in all not as bad as I was expecting by the previous comments, although the end leaves you wondering ... WTF? It was dark, but not so much that you couldn't make out the scenes, and I think it just added to the creepiness and the terror of the situation.
Film quality could have been better, but the acting was pretty decent.
All in all a decently creepy (and yes, brutal) movie with a disappointing ending.