I didn't really watched the whole movie but I just skipped to the best parts were they get killed. Its pretty good if you know what to expect. You'll already feel sick just a few minutes into the movie.
Theres also this part where the hot chick takes off her clothes and you'll be able to see some good stuffs. Yeah..

Oh yeah and we get to see those mutants having sex in the forest... it was only for a few seconds....but I was like... wtf?