Harry Potter and the Cursed Child - Let's discuss! (SPOILERS AHOY.)

It sounds like a bunch of us have read Cursed Child by now... so let's discuss! (I'm starting a new thread so we don't end up accidentally spoiling anyone reading the other thread in /Books!)

What was your reaction? What did you love? Was there anything you didn't love?

I have so many thoughts I don't even know where to start.