Reading some reviews, most of the criticisms are going to Hooper's direction. This is what I feared when he was announced as the director even though I liked The King's Speech and give him credit for mostly staying out of the way on that one.
This will probably be a rental for me.
I don't have a problem with a musical that's all sung since I think The Umbrellas of Cherbourgh is a wonderful movie.
I don't know about the live singing thing though. It gives the actors a chance to really shine, that's true, but I don't know if it necessarily makes the movie itself better. I'm thinking ahead because if it scores with audiences, you can be sure future musicals will do this.
The old classic musicals were pre-recorded, but they were also able to be more cinematic because of it.