This movie is disturbing. It's cringe-worthy. But it's also reality. To dislike it because it's "explotative" or "pornography" is to essentially turn a blind eye to our children and what they are exposed to during peer pressure. Megan was targeted from the age of 10 by older men who knows she'll give them what they want, because she likes attention - yet, at the core of it, she's a good person. I liked that they gave her character depth and vulnerable likeable personality. She was essentially the popular school party girl, but she had a good heart, and there were reasons she was the way that she was. The actress was also very good.
Her friend, Amy, was a little less believable, with the "perfect" family and "virginal" nature. I do understand that she was supposed to be a direct contrast of Megan, but she didn't seem to find that depth. She had an endearing innocence that made me like her character, but the actress wasn't as strong as the actress who played Megan. Still, I thought they were both good.
This leads me to think that the other actors in the movie are the ones being criticized (and that wouldn't surprise me because they were pretty bad...) The two main actresses carried the movie. Megan, more notably.
The film was grim, but it's a reality we have to face as a society. This is what happens to children when they are the victims of predators. We have to educate them on the dangers of becoming a victim - and in order to do that, we have to face some ugly truths. I applaud this movie for having the courage to give a realistic thriller and not pander to sugar-coating what it means to be a kidnapping, murder, and/or sexual abuse victim.
This should make any viewer uncomfortable, or the movie isn't doing its job. If you DO feel uncomfortable, then you aren't ready to face the realities of these topics. That in itself is a danger.