I rewatched the first movie yesterday, and watched Part 2 today.
Overall, absolutely loved the movies. The costumes, the set designs, the acting, the cinematography, the SFX were all top-notch and on point; you could see where the money went. And it's great seeing some serious A-List actors, even in roles that don't have enough of a part for the movie.
Saw a review somewhere where someone referred to the book, the 1980s movie, and this pair as really emphasizing different things that reflected the times they were made in, and I think that's really true. Overall, I think the new movies did a great job of bringing to the screen a lot (but not all) of the complexity of the novel, and certainly didn't water anything down. And beyond that, even knowing what was coming (and for Part 1, even on the re-watch) I still felt awe and some "holy shit!" moments.
If I have a criticism, it's that I felt Part 2 had a bit too much of "Here's Paul and Chani staring at each other pensively" moments, when it was time to instead get the story moving. I'm all in favor of having lots of Zendaya on the screen in my movies, but do something; otherwise, I can just look at a still photo of the two actors and get the same experience.
I'm glad they actually gave Irulan something to do in this movie. But you could film Florence Pugh doing laundry and I'd be entertained.
OK, that's the spoiler-free bit. Now for some more spoiler-ific reviews.