It's silly for the Von Trapp family to weigh in on this, as the story only vaguely resembles history. From what I've read, the real Maria was even more of a martinet than the captain. I really admired the entire production for pulling off all the singing and choreography live the way they did.
I didn’t see it, but I think it’s a wonderful thing to perform this musical live, particularly given its pro-family and family-friendly subject matter. Julie Andrews was amazing, but she can no longer perform. I respect Carrie Underwood for taking this on, especially since she must have known that she was going to be compared to such an talent. Good for her.