After processing Dune a bit, I'll give it 8/10 (after one viewing). Great movie, but not without flaws that bring it down a bit. In the end, it's still a must watch, because we don't get movies like this often. I'd add it to the list of blockbusters of the past 5 years or so that impressed me: Fury Road, Dunkirk, Blade Runner 2049...
The good:
1) Scope is captured incredibly well. You feel the weight of events, the stakes, impact. Monstrous size of everything.
2) Soundtrack is fantastic. Atreides arrival to Arrakis is goosebumps. Sound design and rumbling lows are so good. Unless you have great home audio, it's better to experience it in a theater.
3) The gritty production design works well here. The world feels palpable in a sense of being a descendant of our world. Thopters are freaking great.
4) Cinematography is often gorgeous.
5) Performances are great, but Jessica and Paul stood out to me. Chalamet held his own against proven pros. So good job. Overall everyone were good.
6) Pacing is mostly great. I didn't feel the time. Perhaps at some moments it rushed a bit too much, skipping important build up... Mostly in the middle part.
The flaws for me is that sometimes exposition is rather blunt and clumsy, Leto-Jessica relationship could use couple more scenes and overall the middle part feels like A LOT was edited out. Sometimes scenes felt so isolated and random. I believe Yueh was underdeveloped and used not well. A lot of rather important stuff is completely unexplained or isn't mentioned and I have no idea how general audience will take it. I read the books, so my impression might be skewed.