It's entirely possible that sending the audience out feeling lousy was intentional

Fun premise, good actors, bad writing. This film seemed to have potential at the beginning but it quickly devolves into a trite action film. Ultimately it's very boring.

Tells a fascinating and unsettling true story, and does so well, without pretending to have all the answers.

It's the kind of movie you'll want to see a second time with someone who hasn't seen it yet, to remember what it was like to watch it for the first time.