Lack of good storyline.

This is one of the few movies I've ever seen where the whole audience broke into spontaneous, loud applause a third of the way in.

If you're interested in the topic at hand, you should just watch it and judge yourself because the reviews have gone very biased by people that didn't even watch it and just hate (or love) the creator. I liked it, it was well written, narrated, and directed and it was about a topic that interests me.

One of the film's great tricks is that, for a time, you think it will go down a rabbit hole of unrealistic glorification.