I actually thought it was pretty good. A bit too on-the-nose and heavy handed in its dialogue, but that's the way it always is with big-budgeted network dramas.
The selling point is the cast. Messing, Huston and Davenport bring a lot of personality to their roles. Also, seeing the behind the scenes of a musical build was great. Even little touches like them all being excited for a baseball number.
As for the two stars--McPhee and Tilly--it's too early to say. McPhee is prettier in a more traditional sense, but on a Broadway stage that matters less. And while impressively talented, McPhee is outshone by Tilly's powerhouse voice. Their characters were strangely the least developed of the pilot. So, I don't really have a strong opinion of them as of yet. Though on a small note, I hope Tilly dials it back in future episodes as her acting style is a little too Broadway for the TV camera at times.
And lastly the songs. Unlike another gleeful musical series, it's nice to see the original songs not sucking. The one at the end of the pilot and the baseball number were both very enjoyable.