I watched this movie by accident and while it definitely has some flaws, overall, I walked away finding the whole thing quite interesting. It's an obvious late addition to the torture porn trend in mid to late 2000s horror (a trend I'm not a fan of, but, let's be honest, Saw and Hostel brought back R-rated horror with a vengeance and all horror fans should be forever grateful for that).
There are some profound continuity issues with this movie--the women have impeccable hair well into the experiment (everyone's hair gets greasy and matted after a week, so the makeup department and script supervisor should have raised the point with the director). Someone else has mentioned the men should have had much fuller beards by the third week of the experiment. These are nitpicking issues that, unfortunately, viewers in the age of absolute literalism in entertainment will focus on. Overall, however, the story is interesting and I like the fact that nothing is over-explained. In that way, the movie is a nice throwback to the superior horror movies of the 1970s,
