I was also there last night and I have to say I had fun with this show. It's from perfect, but I definitely skew more towards the mostly positive side of things. I'll preface this by saying I had not seen the movie until Wednesday night, so I am by no means a die hard fan of the movie so I had no preconceived notions of what a Beetlejuice musical ~should~ be. After reading the reviews from DC on here, I really went in expecting to hate it so I was pleasantly surprised to discover this show was a lot of fun. It is definitely going to be divisive, and it will have its super fans and it will have people who absolutely despise it. I can definitely see this show developing a Spongebob like following (a show which I did not care for).
Starting with the positives, the production value is through the roof. As others have mentioned the set, costume and puppet design are all top notch. The cast is full of Broadway pros, so it should come as no surprise they are all giving great performances. For me Leslie Kritzer was the standout, she was incredibly funny in the small bits she had. I also liked Brightman, although I know I am in the minority on that. Any qualms I had with his portrayal came down to the writing and not his interpretation. The jokes in this show, especially Act 1, almost all landed and this show is incredible funny. This version of Beetlejuice is entirely a comedy, and if you go in expecting that and not the movie I think you will have a good time with it.
Now the bad, Act 2 for me is where this show really goes downhill. It really drags and the plot doesn't really know what to do with itself. The show tries to hit certain emotional beats, and for me they all fell pretty flat and felt very forced/contrived. As others have mentioned, the score is easily the worst part of the show, delivering a score that is bland/forgettable at best and just plain bad at worst. It really does boggle my mind that Eddie Perfect has not one but two shows on Broadway this season. I am sure he is a talented guy, but musical theater composer he is not. That being said, the numbers are staged well for the most part and ooze energy which helps drive the show forward when the music fails to do so. The ballads are slogs to get through though (and there are way too many of them, and they're all basically the same).
I appreciate that they weren't afraid to diverge from the source material, I wish more movie to musical adaptations had that courage. I would actually go as far to say every single character in the show is significantly different than their movie counterpart. That being said, they are trying to tell their own story while also trying to include all of the original characters and beats from the original movie. This results in a kind of jumbled plot and is largely why Act 2 feels so disjointed (The Maitlands for example are barely in Act 2 and when they are they aren't even relevant to the plot). I wish they had either committed to telling a brand new Beetlejuice story with new characters (save for Beetlejuice himself), or just did a straightforward retelling of the movie. As it stands now, its a bit of a jumbled mess.
All that being said, I had a really good time with this show. If you enjoy "shut-off-your-brain-and-enjoy" type shows then you will enjoy this show. If you like more cerebral shows, this is not the show for you (but you also probably already knew that). Overall, this show reminded me a lot of Addam's Family. They both have all star casts giving it their all, even when they aren't given much to work with, great sets and costumes and an underutilized ensemble that feels superfluous. And I see it having a very similar trajectory as well. A modest year or so on Broadway, a pretty successful tour, and then prepare yourselves for it to be done to death (no pun intended) by every single high school and community theater around.