Dune definitely a great movie. Some scenes wee gratuitous, like the Heartvalve plugs, and Sting was in it because he was popular at the time, ( a big over the top acting). It is a great movie though. It's amazing though if you watch the whole movie. When they show it on T.V., they cut so much out of it, it almost becomes nonsensical. If you don't see the very beginning, with the artwork etc, and the explanation of why society has turned what it has turned into, it kills the movie. Of course, if you read the books, different story.
It is an underrated movie though. I didn't think the Sci-Fi one was so bad though, and in many ways, because it went much further than the movie, it was more satisfying. Aliya was an abomination, but you wold think (again, by only seeing the movies) she was great.
It is one of those great movies, that if done a little bit later, by the same people, could have utilized better C.G. to further enhance the story as they spent way too much money on props, which sacrificed other aspects of the film.