This Film Is Not Yet Rated: 7 out of 10.
I love docs, and this one about the MPAA is quite entertaining. The MPAA oversees a "voluntary" film rating system, but as Kevin Smith points out in the film, it's anything but voluntary if you want to promote your film and maximize revenue. For 35 years they've done their thing with no transparency or public accountability of the process.
In the documentary we actually learn about this film getting an NC-17 rating and losing the appeal by a 10-0 vote. This version, with this additional footage, was never rated, and that's why you can't rent it at Blockbuster.
Voluntary, indeed.