Hate to be negative, but...
I'm afraid the good reviews will cause more horrible documentaries about good subjects to be made.
It seems this film maker went in with one goal: the "fly-on-the-wall" approach. And apparently that's something that is currently in vogue with critics.
The first problem is he doesn't even achieve that, the people involved are clearly aware of the camera's presence. It's not so bad for the performers who are used to being watched but the behind the scenes creative people often seem awkward. Even crappy reality TV shows by using omnipresent video cameras achieve the effect better than this film.
But the bigger problem is without any context, all the attention to detail is meaningless. It's like watching a painter mix a color without knowing what it's going to be used for in a painting. Or a writer agonize over which word to use without reading the sentence it's going to be put into.
Instead of making the process seem impressive, it becomes tedious. Instead of using the knowledge of all the work that goes into a ballet to make the final work all the more interesting, we get more tedium, and a long shot of the choreographer walking down a hallway (WTF?!).
Obviously the film maker isn't at all interested in this choreographer's artistic vision for this particular ballet at all, just a hipster cool fly-on-the-wall look at "ballet". It's a film made for people who would never sit through a ballet, but want to feel like they are the kind of person who would.
The film ends with what could have been a great surprise: that while staging this ballet, this brand new choreographer also had to learn a ballet to perform on the same night! There were 2 choices, show this fact all through the documentary to show what an amazing feat this was, or make it a big surprise at the end using film technique to make it awe inspiring with flashbacks to his grueling schedule. Instead it is THROWN AWAY leaving many viewers baffled because it doesn't even seem possible. So what we get instead is a ridiculously long shot of the venue exterior at twilight?! Again the film maker is putting his own interests (sorry it's a pretty shot but not THAT interesting) above the work of the brilliant talents involved in making the final piece that we barely get to see at all.
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