The reception to it from the ballet world has been both hot and cool. After seeing this Charlie Rose interview with Portman and Aronofsky, I can't help but think they hold the ballet world with some contempt, and they have pretty warped views about it:
http://www.charlierose.com/view/interview/11324
That's all the more surprising given how much cooperation they've received from the ballet world, and how much they've been exposed to it also. Natalie Portman is also dating a principal dancer at New York City Ballet, so one would think she would know better.
This review from a well-known and regarded critic seems on point:
http://www.artsjournal.com/tobias/20...he_movies.html
--Andre