As much as I liked the Dune books, if you're looking for "realistic sci-fi", Dune just isn't it, it's purely fantasy. One of the main premises the whole story

As much as I liked the Dune books, if you're looking for "realistic sci-fi", Dune just isn't it, it's purely fantasy. One of the main premises the whole story rests upon is the idea of genetic memory, which isn't real. Lord of the Rings is more realistic than this. And that's just one point; there's a bunch of other stuff in Dune that really makes no sense in our universe.