I watched it. Overall it wasn't bad. Audra McDonald was the real standout. I hadn't realized that she had an opera background before this. Carrie Underwood can't act. The initial title song was pretty rough (partly due to the fact that everybody is ingrained with the Julie Andrews version of the song and Carrie's more of an Alto and thus had to sing it in a lower register). The subsequent songs were much better.
Staging was neat for a live performance. I always remember my high school version of it when a piece of scenery crashed backstage while Maria was singing "the hills are alive."
Stephen Moyer was the weak part. Fortunately they scaled back a lot of his singing. Borle is a good singer but they put him in a role that only had a partial of two songs. The kids were good.
Note that if you get the iTunes audio of this (why I do not know), that it's not the live performance. It was done in the recording studio at the time the orchestrations were recorded (which were NOT live during the broadcast).