What makes it different from others?

Nice effects though.

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.