My problems with the Yates films is partly adaptation issues.
With the exception of Order of the Phoenix. Phoenix is my least favorite book because it's pretty much Harry sulking around for nearly the entire thing. Kickass climax in the Ministry though. I think the movie sped things along well.
With the 6th film, my issue was that they went all in with the teen romance angst and ditched nearly all the Voldemort backstory. It also has one of the few Rickman moments I don't like. That being when Harry confronts him as he's fleeing.
You know how everyone complains about Gambon being completely out of character for screaming at Harry when he's supposed to be calm? Well I feel the same way about Rickman in this scene. How he calmly tells Harry he's the Half Blood Prince.
In the book, Snape is screaming at Harry, he is pissed that this little shit he's been protecting is trying to fight him. He loses it. And none of that is conveyed in the scene in the film.
For the final two, I think they're mostly fine. I had a few issues with the final battle.
1. For Snapes memories, they leave out the scene of him calling Lilly a mudblood, which really fails to set up the whole thing.
2. I absolutely hate that the final confrontation between Harry and Voldemort was a CGI battle. The more subdued confrontation in the book where Harry taunts him for a few minutes, and then his spell rebounds, was so much more satisfying. Because Harry can not fight Voldemort. He found a way to outsmart him, and that was far better for me.
My other issue with Yates is just the aesthetics. I know the films and books age with the core audience, but it's just so... dull. It has that muted DC film look to it. I feel like, even though it's a serious story, it sucked the magic out of the fantasy world it's supposed to be set in. Dull, grey, nearly everyone is now in normal clothes rather than robes. It just doesn't feel like a fantasy world.
Definitely gonna watch this later.
Someone posted this in another Potter thread, but this article on the cinematography in Half-Blood Prince really changed how I saw the movie.
https://www.diyphotography.net/harry-potter-half-blood-prince-cinematography-bruno-delbonnel/
But it also has this...
Watch Slughorn's arm at about the 30 second mark...