This movie is big. It's meant to be on the big screen. The visuals are captivating, the music is mesmerizing and the actors are convincing.
This is an adaptation of the Dune novel from 1965, and it covers about half the book. I have read the novel long ago, but I'm mostly familiar with the Dune universe from the Command & Conquer game Emperor: Battle for Dune. It's a vast universe with politics, religion, tribes and houses. The movie does an excellent job of placing you in this grand setting without over-explaining everything, but also without feeling completely lost. For someone new to the Dune universe you can easily recognize who the "good" and "bad" guys are and follow the plot, without knowing who all the different names refer to. But it's not dumbed down so that those who will recognize the names feel patronized. This is very hard to pull off, but I think this movie did so masterfully.
I would describe it as a mixture between Lord of the Rings and Star Wars. You follow individuals in a grand and complex world. The majority of the movie takes place on a desert planet, so it really needed an amazing soundtrack to elevate the experience - and it has. Hans Zimmer turned down Tenet to work on Dune, and I think he made the right choice.
However, this is only "Part 1", as it says in the beginning of the movie, so you know it won't be a complete story. I was ready to watch Part 2 as soon as it ended, but will have to wait. LOTR The fellowship of the Ring would be an insignificant movie without The two towers and The return of a king to complete the story. Together they are great, individually they are not enough. So it is with Dune - It is a great introduction, but it desperately needs a part 2 to conclude the story. And there better be a Part 2!