Hairspray is not a show with which I have a ton of familiarity, which means that I don't have much in the way of preconceptions or expectations going into NBC's broadcast, and I consequently haven't been following the production as rigorously as I did for the past couple of NBC productions (Peter Pan LIVE! and The Wiz LIVE!).
That said, I am listening to the soundtrack right now (on shuffle) and thoroughly enjoying it, with You Can't Stop the Beat, (You're) Timeless to Me, Mama, I'm a Big Girl Now, Come So Far (Got So Far to Go), Ladies Choice, It Takes Two, Welcome to the 60s, and Good Morning Baltimore being my favorite songs.
I also have to disagree with the criticisms of Ariana Grande that people are batting about. I don't generally listen to her music in general (it's just not my cup of tea), but I really like her vocally here, especially matched up with Jennifer Hudson.
If the production is even half as good as the soundtrack, this could potentially bump Peter Pan LIVE! out of its place as my favorite of NBC's productions so far.