This has a very omnipresent epicness to it, and you feel like everything that is happening has heavy consequences. This is the main strength of the film, and it's achieved through the great cinematography and audio design, but mostly through the layered, emotional yet subtle acting. It's all really quite excellent. Obviously, it's quite dramatised, but it'd be awfully boring otherwise (as can be seen by watching the original interviews).
Now, despite all its positives, in a way it just didn't reach me somehow. I didn't get as engaged as I felt I should have. This is strictly on a personal level, of course, but, while it's very interesting and enlightening, it's more art than it is entertainment. For many, that's a plus, in which case, you should not miss this film. In my case, entertainment is the final goal of art, so I was a little disappointed.
Don't let that deter you, though. This is still a great movie that makes you think. The historical value and the parallels to the present are reason enough to watch it, let alone the technical prowness.