Saw this a couple of days ago, and as a play, my friends and I had great fun, but as a musical, it was underwhelming. The music was tuneless, and it felt just unnecessary. Caroline in the City was one of my favorite shows back in the day, so I had high hopes when I heard that the writers worked on that show. So yes, it does play a bit like a corny sitcom, but that's something we thoroughly enjoyed.
There were so many Jewish jokes (Yiddish pronunciations and whatnot) that I'm unsure how this would appeal to a more diverse audience. I laughed at every single one, but people have talked about how Something rotten has a lot of theater jokes that not may not be accessible to everyone (haven't seen it yet), and I think this is definitely in that same vein.
The performers definitely milked their jokes with the two mothers getting the most laughs. Sierra Boggess has a gorgeous soprano voice, but the songs didn't give her a chance to show that off. Lisa Howard and John Grisetti were fabulous, and his entrance was so good. Everyone is singing her praises, and she deserves it, but he stole the show, to me. Considering that David Burtka is the groom, he wasn't given a heck of a lot to do. He's a great dancer, but he had but a forgettable brief moment to do that. Chip Zien, Montego Glover, etc. made the most out of what they were given.
Overall, my friends and I really enjoyed the show and have already recommended it to our Jewish mothers with the preface that the music "isn't great."