The concept and set up were good, but the movie just didnt deliver. I think its primarily because the main character was so dumb that you just wanted to yell at her for her constant stupidity. The only male in the movie was clearly a total psycho and the actor is to be commended for finding the fine balance of menace and fragile ego often associated with such individuals. While he was not likeable you could at least admire his manipulation of the lead actress, whose character was so blah that it was impossible to care about her well being at his hands.
Not particularly violent, but the occasional flash of labia, boobs and penis, as well as two lesbian scenes that included finger banging (off screen), definitely mean this is not for kids.
I dont regret watching it, but do regret the missed opportunity as it could have been a really good scary movie.