I gave it 3 stars....I agree with TheDeceased, technically there was nothing wrong with it...score was good, camera work was good, choreography was well-done, the actors did well with what roles they had (though I was really disappointed to see an awesome actor like Barbara Hershey wasted in such a cliched overbearing stage mother role).
Things I actually really liked about it: having Natalie Portman's character replace Winona Ryder's character as the darling of the stage is a fucking BRILLIANT piece of meta commentary. I thought that was a great casting decision. I also think that Natalie Portman was actually quite amazing in it, she really pulled off the fragile unbalanced psyche of the character with her body language, the way she spoke, everything. She should definitely get an Oscar for this role, I think she put loads of work into it.
Things I didn't like: I really thought the plotline was just another example of "repressed woman discovers sexuality, goes crazy". Boring, trite, really overdone and misogynistic. I would have been way more interested in a film where the sexually repressed woman discovers that side of herself and uses it to become a stronger person with more agency. Instead, it's one more in a long line of stories that show women can't handle their own desires, and if they don't have a man to rein them in they're just gonna go off the rails.
I also went in to this expecting it to be a lot more subtle, surreal and David Lynchian for want of a better term....nearly every other person who saw it before me said that it's a massive headfuck, and I just don't see that? Maybe I am just too jaded, but I really don't get the big deal about this film. It is technically VERY well-made, but creatively pretty bankrupt IMO...