The question is which version of the first movie are you referencing?
I was fortunate enough to see a copy of the original film with David's name in the credits before the train wreck that was the second version. The original opening of the movie was brilliant and didn't require the butchering that came afterwords in the second edit.
Fun fact about the first movie. Dino De Laurentiis and his daughter Raffaella De Laurentiis both had executive roles for Dune. Raffaella is the sister of Veronica De Laurentiis, who is the mother of Food Network chef Giada De Laurentiis, neither of which had anything to do with Dune but makes for a nice bit of De Laurentiis family trivia.
The only way Dune could be given justice with the considerable amount of story to be told is in a mini-series format rather than a 2 hour movie. The Lynch movie was a good effort given the limitations of practical effects of the period.