Wasn't sure how many stars to give it. Five is too many, three wouldn't do it justice either, so four it is. And I did enjoy it, sometimes even really enjoy it. 
 For one, it's really nice to get back to a world you've loved for so long, and to see how it's grown. And the way this was done, it's basically up to you if you want to consider it canon, fanfiction or (in my case) a bit between the two. 
 There's a good bit of bad in it. Odd characterisations. Ridiculous things. Incoherent ones. And stuff that was just... *sighs* 
 But there's also good, deeply satisfying stuff, that can help conclude the series. Or not. 
 I think everyone is going to experience Harry Potter and the Cursed Child differently - which is true of every book, but maybe a bit truer with this one. I'm mostly happy I read it, and would love to see the stage version. 
 However, one piece of advice: it's probably best to start it without any kind of expectations. Easier said than done, I know, but still.