Strange and fun to watch movie IMHO.
I admit the ending is over the top, but the fun of getting there is what makes the movie enjoyable to watch. The group brainwash/multilevel brainwash theme may not be original, but the style is quirky enough to pull me in. Also some of the visuals are impressive and creative for a low budget film.
Like Vincenzo Natali's other films, this is a cult film. Some will love and it and many will not like it. I would just like to take this moment to thank Mr. Natali for having the guts to take chances and be different.