** spoiler alert ** 
 So many thoughts. I came in a bit biased from the get go because a friend saw a preview and I read the leaks. I'm still a major Potter fan - been to Wizarding World in Orlando twice, and went to the last 3 books midnight parties, even while traveling in South Africa. 
 First, the plot is very bad. It is a story that needed a bit more brainstorming. It is very flimsy, and needed adjustment in so many places. It is also unnecessarily long for a play; there is too much filler. 
 It also contradicts the time traveling rules set out in PoA. 
 It also does not feel like a new story at all. Unlike the previous novels, the book feels like a massive Deja Vu. We go back to the the Triwizard tournament, to that awful book 7 epilogue, Umbridge, Bane, etc... and instead of being pleasant to revisit old characters and pals, it just feels off and awkward. 
 McGonagall does not read like before. She comes off unsure of herself sometimes, and allows herself to be bullied in a way that broke my image of the character. Ginny is boring, and except a few lines that try to establish the contrary, she comes off as nothing else but a mom in this universe because she does nothing. Hermione is ok, and she and Ron are both consistent at least. Rose does nothing. 
 The queer baiting... I'm convinced that in true Rowling fashion, she is going to tweet 7 years from now that Scorpius was bi (or gay). This play has so much romantic tension between Albus and Scorpius that it is ridiculous. This is not just friendship love, like we saw with Harry and Ron in the second task of the Triwizard tournament. This is full on nascent romantic affection. Then there's the no-homo to squash any thoughts that you actually read what you just read. 
 There are some serious issues with the treatment of women in the play and its alternative realities. Ron fears his wife Padma in alt universe 1, and Hermione is an angry DADA teacher because she is a spinster. McGonagall is yelled at by Harry because she doesn't have kids and couldn't possibly understand. Rose is used as a human no-homo sign. Regular universe Hermione is just ok, nothing spectacular. Ginny is a mirror for Harry to see his own flaws and to grow as a character. Lily (and James) are sparingly mentioned. 
 Scorpius is the only good thing about this play. He comes off as adorable, funny, and endearing. Albus, is a little shit full of angst and middle child syndrome (maybe some same sex attraction discovery?). 
 It's a mess, and maybe JK should stop. I know she won't cause she's receiving carriages full of gold for ruining Harry Potter for us, but one can only hope.