I also was at Opening Night and just got home.
I thought it was okay. I felt like the book to it was decent but it fell flat at certain points and some of the jokes were cute but not laugh out loud funny. I did however enjoy the tossing around of references to various playwrights although I can see many an average viewer not finding those things to be funny at all because they may not be familiar with a lot of the things which are mentioned.
I felt Burke Moses was horrendously underused. I thought Roger Bart's part was smaller than it should have been but he did an excellent job in it overall. Now, I'm not a fan of Nathan Lane, but he didn't bother me either way in this. I really loved the song "Ariande" and thats a lot for me to say considering he was singing it and I don't usually like his singing. I also loved the three graces, but the woman who played the Amazon was horrible. Ugh.
Overall, I found it to be an enjoyable show but it didn't blow me away at all. I had read somewhere that people thought that during previews the second act was tedious and boring but I didn't find that to be the case. I thought it was interesting and entertaining but it didn't make me think "wow."
And hang on, when did you win the discus?