I think, like most documentarians, the maker of the film did his best to present what his perspective on FMA is. In the sense that it is relatively even-handed and well-shot, I think it's a decent overview of some of the many arts that make up FMA. By no means is it an authoritative look at the evolution of FMA in the last hundred or so years, but that may not be possible. I enjoyed the movie mostly, and definitely appreciated the filmmaker's passion for his project.
I'd propose that, without being hokey, the best FMA documentary is the one each player assembles from his/her training. It's a living art; that makes it hard to pin down.