Saw it twice and I enjoyed it a lot, though I was in college and easily impressed - I recall reviews were not kind. I thought it had some clever staging - specifically, the mirror over the top to showcase the disco floor lighting. I thought James Carpinello was great - the oozed sex appeal the same way Travolta did on film, he nailed the iconic dances, and did well on his scene work, Orfeh was a stand-out,. That voice on that score was pure heaven. I would pay good money for a recording of her doing "Nights on Broadway".
As an aside, I recently saw a production in Sydney which was probably one of the worst things I have ever seen. They had four singers (winners/contestants of X-Factor/The Voice/Whatever) do all of the songs!!! Tony's parents were played by famous Australian sit-com stars, all their scenes were filmed, and appeared on a giant screen that came down whenever Tony sat down at the dinner table. And they danced hip-hop But I digress.
"Observe how bravely I conceal this dreadful dreadful shame I feel."