Let's start with positive - I liked Scorpius and Draco Malfoy really surprised me pleasantly. That's it.
Now, let the rant begin.
If I could separate it from Harry Potter books, it might be a rather good play but because it needs knowledge about Harry Potter characters I can't do this and it turns the whole book into a disappointment.
I was prepared to read a play and submerge into Harry Potter world but this wasn't the eighth book. This was like really bad fan fiction. One of my favourite characters was turned into a pathetic joke. Rose's role was so tiny it was almost non-existent. There was no social interaction between James and Albus and it was just weird. They were brothers and I thought at least Harry and Ginny taught their kids how to stick together but apparently they didn't. The way school didn't do anything before the 4th school year was just stupid and made me angry. Where were the teachers when the problems started on day one? Those are only few of the things that popped into my mind while reading this book.
I have to admit that I would like to see the play because while reading I also asked several times how they would do things, like did they drop the temperature while dementors were on stage.