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First I'd have to read the book. :S I don't know, the first book always does it, but the themes and plots of the further ones are quite uninteresting to me. The first Dune is just so focused and self-contained.
I really recommend giving the other books a try and godemperor, in my opinion is a real high point of the entire series. In theory you can read it on its own as it plays a good 4000 years after children of dune and is a pretty much self contained story