Besides the fact that Dune is promoting many useful messages (about willpower, the role of fear etc) I think the main reason I like it is its individuality among science fiction stories. Most science fiction stories that take place in the far future, feature a human civilization where computers are playing a dominant role along with a blusteringly rationalistic kind of science which doesn't allow any kind of dogma. In Dune Universe though the humanity have taken a different course. The use of computers and robots stopped at some point while mysticism continued to be spread among the people and religions kept being followed. Other traditional elements of of human history are also kept, like the governing ways, the significance of family bloodlines etc, elements which are condemned by many modernists and the way they would imagine future. Personally I would find it most possible for the humanity to follow such a course in reality too, as mysticism and tradition are things that always played an important role in human societies since the first ones were created - we can say that they are part of our DNA. While the current fury of human about computers and exclusively rational science is something transient that was formed so quickly and will probably go away as quickly. *To avoid misunderstandings, I am not trying to look like a blamer of technology or something. My computer has an important role in my daily life too and I see that computers have offered and can still offer a lot of progress to human if they are used correctly. I just don't think that everything in the cultural evolution hereafter will revolve around them.