If you didn't like this movie, I hate you, you are wrong, and I hope you stub your toe.
This is among the most faithful adaptations of a book, never mind Dune, that I've ever seen (and I adore the LOTR extended movies). The storytelling is outstanding, the visuals are stunning, the soundtrack is atmospheric and evocative. I loved every minute of it.
Some people have called it slow; that's hard for me to understand, as literally every scene drives the plot forward. There's so much going on it's possible to miss the excellent performances we're getting on screen.
It's rare that I have such high expectations of a film be met and exceeded. Cannot recommend it enough.
And if you're able, DEFINITELY see it in the theatre. Something this majestic deserves the silver screen.