You're absolutely right about that. The movie simply doesn't get enough love. Most people criticize that the storytelling is confusing and those who have read the book criticize the changes they made to the story. I personally never had a problem following it, and after I read the novel I was willing to look past the changes. I personally feel it's visually a magnificent film which tells an interesting, complex story. The movie definitely has gotten more appreciation as the years have gone by, but it hasn't reached that critical "cult" status that something like Blade Runner (another excellent movie ahead of its time) has.
I'll tell you what. If I win the lottery, I will commission the best of the best customizers out there to make a series of 1/6 Lynch Dune figures and give them to everyone on this thread!