I saw this at the Munich Film Festival and was very affected by it. It is not a perfect film -- others have already mentioned the clichés--but the overall effect was very powerful. The main actress was brilliant as well as beautiful as the disturbed 14 year old and I predict she will be a future star.
The director had some interesting things to say during the Q and A session afterwards. Commenting on the explicit sex scenes she said that it was realistic and that teens nowadays were having more and more extreme sex as a direct result of porn. "I guarantee teens here have seen double and quadruple penetrations online!"
"Enjoy" is the wrong word for the experience once has when watching this but it is a film that should be watched by parents and teens everywhere.
Is this the kind of nihilistic world we are leaving for our future generations?
As a side note--I am sure this film will be banned in many countries (which is a pity) as it could be seen, by the more conservative, as child pornography.