Let's be realistic.

It's fun, it's light, [but] it has a hard time when its tries to get heavy.

This is a must-see and one of the best documentaries - and films - of this year.

Just intense enough to provide a much-needed diversion, just lightweight enough to make you forget about it soon after it’s over. It’s not exactly “good,” per se, but it does what it sets out to do in terms of putting us on edge, which makes it … successful?