All that is set up leads to epic confrontations, only strengthened by the amazing acting of all cast members and by Hans Zimmer's epic score. This all makes the universe feel much more believable.
It sets up the plot and the world it takes place in perfectly, and shows us hints of traditions and cultures at the same time. Villeneuve has succeded tremendously in the worldbuilding of this movie. Being the classic story that it is, I don't think I need to go into detail about the plot. After, all, we're not dealing with technological and scientific developments and ideas here, but instead with an empire, arisocratic houses, magic and cultures, only it takes place in space. It's often described as sci-fi but I think that fantasy is a more appropriate description. It is not often that a movie telling a story on this scale is this good.
If you're deciding whether or not you should go see "Dune" in cinema: you definitely should go.