That looks interesting, I will have to take a look at it.
My recent favorites
Muscle Shoals
Twenty Feet From Stardom
Sound CIty
Beware of Mr Baker
Talhotblond (not a great doc; a murder that took place very close to my boyhood home)
Enron: The Smartest Guys in the Room
Food, Inc.
Don't necessarily recommend, but I will give the ringing endorsement of "watched the whole thing". I don't really like when a doc feels like it's exploiting people to make you feel better about yourself.
The Imposter
Aileen Wournos: The Selling of a Serial Killer
Brother's Keeper
Nightmares in Red, White, and Blue
Vernon, Florida
Confessions of a Superhero
Others
The Queen of Versailles (did not finish)
New York in the Fifties (did not finish)
The American Scream (did not finish)
Room 237 (I wish I didn't finish it, but I did)