So I just saw this and I have some thoughts.
1. The cinematography was unreal. It was beautiful to look at the whole way through.
2. The sound editing was garbage. There was so much dialogue that got lost.
3. I know this might make me sound like a snob, but I really like how much you would miss if you don't know the books. Take the fight at the end, when Paul was fighting and kept slowing down at the kill moment. They asked "is he playing with me!?" But if you know the books, it's because he's used to fighting with shields, where you have to slow to get through the body shield. There were quite a few moments like that.
4. I'm glad they're not showing the worms more. Keeps building the tension. Kind of like Aliens.
5. They should have included more plot and character development, and fewer beautiful views.
I rather liked it. 4 out of 5. I'm excited for the next one.