Overall, I enjoyed this movie. But I do think its weaknesses were rooted in the fact that the film tried to do too much in the way of subtexts: feminism and vegetarianism in particular. Because of these two focuses, we the audience were subjected to frame after frame of pointlessness and male characters so dreadful it took away from the believability of the movie--the acting in the first 15-20 minutes or so was especially rigid.
What I did like about the movie was the gloomy atmosphere (I refuse to believe the Animal Planet inclusions had anything to do with that, by the way), Jordan Ladd (whom I have admired since Cabin Fever), and the horrific visual gags centered around the premise of the movie as outlined in the plot. This is one I definitely need to watch again in a month or so, now that my expectations have been set (lowered?).