It’s not bad or unwatchable but despite the amplitude of the spectacle, the end result is underwhelming.

The movie's not perfect, but it sticks the landing of its message. It was engaging - thrilling at times - and I personally thought it was a great time.

It is interesting even when nothing much happens, which is for most of its 3-hour running time. Read full review

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.