If I knew for certain that part 2 was in the works and was guaranteed to be be made, I would give Dune (Part One) 9/10. The acting, the effects, set design, etc are all top notch and as faithful to book as it seems possible. The pacing is what loses that point. I see their intentions for the few major changes and am all right with them.
But…. We are not guaranteed that Part Two. That really brings it down for me as the movie just stops rather than ends. I knew going in that the movie didn’t cover the whole book but hoped that they would be able craft a complete narrative that would come to a satisfying climax whether or not a sequel ever gets made.
At least we got some good board games out of it!