http://www3.ifctv.com/thisfilm/about.php
From what i've read, the movie opens up the issue about leaving ratings to a small group of individuals, but fails to make a cohesive statement which is easily understood. The movie gets weighted down suppostedly on the dirt of getting to know the current regime of Ratings Givers.
Here's Roger Ebert's Review:
http://rogerebert.suntimes.com/apps/pbcs.dll/article?AID=/20060914/REVIEWS/609140301/-1/RSS
The MPAA insists that it has procedures that it applies evenhandedly. But the procedures are secret so nobody can tell what they are. If something is not allowed, it's because it's against the invisible rules.