I can confidently say that this is the worst film I have ever seen, and I usually love foreign films. The movie is nothing more than poorly-made violent pornography. If you choose to see it, prepare yourself for endless sexism, gratuitous nudity shots, and a stupid sensationalized rape scene, which I'm sure is the main appeal for the people who like the movie.
Additionally, the plot meanders aimlessly, and none of the characters is likable. Many scenes are filmed from the woods surrounding the river the girls are on to give a constant feeling that someone is stalking them, which was a pathetic attempt to make up for the lack of story to tell.
Perhaps I wouldn't have wasted my time to see the movie, if it had been accurately described in reviews.