Overall I thought it was good and was pleasantly surprised.
I did not realize they were splitting it into 2 parts and this was only part 1 (ending at intermission of the play). That will be interesting to see how they do part 2 because if I recall from the play the 2nd act is both much shorter and much weaker. I think all of the popular songs are in act 1 as well.
The lead actresses were both really good. Kind of annoying that they appear douchey in real life but it doesn't roll over into the film, they both did a great job. Ariana Grande was surprisingly good given that she's really just a singer, not an actor. She didn't just nail the singing parts, she was charismatic and nailed the wit/humor stuff as well. You wouldn't even know she's not really been in a movie before.