There are two groups of people who write at IMDb, the pessimists and the optimists. The pessimists love to complain about something or other in a film. The optimists try and find something good. DUNE probably ranks as one of those that feels like it's going to be good, but leaves a confusing, lackluster feeling in its wake. In an attempt to be optimistic, I will try focusing ONLY on the good parts. This might be tough.
I will give David Lynch credit (indeed, as Frank Herbert did when he saw this) for trying to take an enormous amalgamation of things and ideas from the novel and trying to turn them into a movie. Lynch's visual style is very raw here and everything in the production design seems to be under his spell.
The sets, costumes, cinematography, and choice of cast is excellent. All of them lend a flavor of difference that transcends whatever confusion is on the screen. (On the side note: I was sick of hearing Kyle MacLachlan repeating himself over and over) The creature designs by Carlo Rambaldi are very Lynch-ien, even though we rarely get to see them.
Overall, a sci-fi epic that requires a lethargic butt, an open mind, and a copy of Frank Herbert's novel to enjoy. Still, it is far superior to the TV miniseries of late (I know saying that is blasphemy to some). I refuse to rate this with stars or anything else.