Harry Potter and the Cursed Child: Parts One and Two

I read this in one sitting, and I thoroughly enjoyed it (and I imagine it very much comes to life if/when you see the actual play), but a part of me can't help but see it as glorified fanfiction and so that's how I'm looking at it in my head. Which might change if it ever actually becomes a fleshed-out novel or something.
I don't really like it overall as an official part of the Harry Potter story, but seeing it separately I actually really liked it and enjoyed it. Mostly it just makes me want to reread all the books again.