I haven't read the books, but liked the movies. This is more of a expression of what I liked than anything else... But while JK turned into a mess, the movies generally were good even though

The first two are okay but the third one in particular is a favorite of mine. It's less because of Harry Potter and more about just how well it stands as a well made movie. It is darker in the literal sense and movies a lot more away from the magic wonder feeling the former movies had. In particular by adding a horror like element that adds so much more tension then the older ones. When I was a kid it was terrifying how unsettling and discomforting things were made to be.

And despite it being the movie which used the never-seen-after completely world breaking time turners, it does an amazing job actually using them.There are all these things that go wrong, but just in the right way that the time loop works out without actually changing the first iteration we saw. The books probably do it the same way, but as a visual adaptation it's right on the mark, down to the sense of time running out when the time travel shenanigans happen.

Then again, I'm weak for "good feelings" making a difference and similar, so the protection spell that chases the Dementors away at the crucial moments sure makes me giddy. So it's a thematic bullseye for me, despite how much emotional discomfort the movie played with to get there.