I was left disappointed, but still like the movie and am looking forward to the next one. The visuals are great, the world design is great. But overall it strikes me as a very surface-level Dune adaptation... which I guess is inevitable, considering how dense Dune is. A lot of threads, a lot of the things that make Dune "Dune" were very thin or outright missing IMO.
I was hugely let down by the Harkonnens, and the Baron specifically There's none of the uniqueness of his situation, there's almost no exploration of his political machinations, they barely mention the Emperor which IMO is necessary to provide a whole other dimension to his character... and somehow, for some reason, there's almost no indication of his brand of cruelty. He's basically just Darth Vader... but not Darth Vader in a whole movie, mostly just Darth Vader in the first 10 minutes of Star Wars. He doesn't even have his "destroy Alderaan" moment.
Everything that's interesting about him in the book only happens in moments in the movie, or doesn't happen at all. He's just the big bad... might as well be a Bond villain. And as I type that I realize that's probably unfair to some of the better Bond villains! They give lip service to some of this, but it's pretty weak portrayal overall.