I'm coming here from Reddit, but I figure I can add my thoughts. I was in town on the 28th and I went to the first NY preview. So I'm no Broadway expert, but I'm from Chicago so we do get a decent number of shows, so maybe getting a perspective from someone from out of town might be good?
So....
It was honestly kind of a mess. Songs weren't memorable outside of the two from the movie. I did enjoy Dead Mom and was probably my favorite of the new songs... but couldn't even remember anything about the song outside of "Hey mom, Dead Mom" so it didn't even stick with me. The characters had ZERO depth for the most part, and when they DID have depth (Lydia) it was inconsistent. In many ways it couldn't decide if it wanted to be a serious Beetlejuice story or if it just wanted to be a spoof parody saying "LOL this is a Beetlejuice musical, is this funny?" It kind of had the same problem as Xanadu in that regard if that makes sense... Except I feel like Beetlejuice had source material that was a bit more respected.
I don't want to just parrot what everyone has already said (i.e. amazing set design, talented cast, but wasted, blah blah etc. etc.) but, I will say that I think this is a show that has a lot of mainstream appeal, so I think it'll do well.