I read the Dune books after seeing Part 1, and I was slightly disappointed at how _little_ characterisation most characters have. Most of them have no history or relationships outside of the ones present in the book and very broad "Paul's doctor came from the secret society of very good doctors".

IMO Dune a good piece of literature, but the lackluster worldbuilding makes the Universe feel small and empty. Nothing interesting happened in the prior 10k years to anybody who's not a protagonist.