Watched this yesterday - another really strong addition to Villeneuve's work, in my opinion. Not a perfect movie, but thoroughly entertaining and well-made.
I just love the world building in both this and the first one. The set design, costumes, weapons, vehicles, machines and language all feel otherworldly, but still believable and grounded in a way. It's fantastically well done. Of course, you need to suspend your disbelief with the worms, and there are some rules about the weaponry that are not fully explained, but that sort of stuff is to be expected from sci-fi.
Performances are generally strong with a few hiccups here and there. Javier Bardem and Rebecca Ferguson are the best of the bunch, in my opinion, but Chalamet is certainly also good in the lead. However, I'd say Zendaya is not a particularly strong actress. It's not catastrophic, but it does shine through in a few scenes. I also didn't like the Harkonnen's as much in this one. The Baron was extremely memorable in the first, but didn't have that same menacing presence here, and Feyd-Rautha seemed almost a bit cartoonish in his villainy. Perhaps I was a bit disappointed with the emperor. They cast such an iconic actor in Christopher Walken and it feels like they didn't really utilize him.
As for the plot it moves along in a nice pace, and it is generally understandable what happens and why. It is apparent that it is adapted from quite a complex work, so there isn't really enough time to flesh out the motivations of all the factions. We've got the Fremen (believers and non-believers), Harkonnens, Bene Gesserit, The Emperor, and the Landsraad of noble houses. Just a lot of moving pieces, but it is generally well-handled. For an almost 3 hour movie, there was only one time where I felt it's length, and that was around the scenes on Geidi Prime.
I'd give it a solid 8/10. Happy to see it is set up for another movie, and I saw Villeneuve comment on this as well. If this is another financial success, I don't see why they wouldn't.