You should check out this Film which is now out on Netflix. I think it's much better than past documentaries as far as promoting a plant based diet. It's got huge production value (NFL players, MMA stars, Arnold Schwarzenegger), shocking segments, and many many cherry picked facts, anecdotes, and some silly studies showing erections can held 400% longer when consuming bean burritos vs meat burritos.
Lots of debunking and debate back and forth from both sides on youtube.
A really decent SCIENTIFIC REVIEW WITH FULL CITATIONS on tacticmethod.com that you should check out.
After watching, I'm hoping there's an omnivores version coming soon....which I think there is - Frances McDormand to pen screenplay for adaptation of The Omnivore's Dilemma