Meh.
I found this documentary kind of slow and dull. I suppose it did show some of the drudgery that goes on behind the scenes of a very colourful and exciting medium.
However, I really was expecting Miyazaki to be a little bit more likeable and insightful than he actually is (in this film, at least).
I think it would've been time better spent just watching a Ghibli film instead. 6/10