I agree, Lynch's Dune is not perfect in terms of its visuals. Baron Harkonnen is a good example: having the character fly through the air on little jetpacks was a ridiculous departure from the novel. Also, the characters' personal shields, while kind of cool in the film, were not depicted as described in the novel (as sort of a crackly, skin-tight electrical field, if I remember correctly). However, elements such as the stillsuits, the sandworms, and the overall medieval look to the film was exactly what I had imagined while reading.

That being said, the Guild Navigator in Lynch's Dune, while a departure from how they are described in the novel, was a very cool interpretation, so I agree that some "creative interpretation" can be a good thing.