Dune is one of the best books, full stop, and Dune is one of the best writers, also full stop.

And you are right to flag his "implantation" of other cultures in his books - it's not just in Dune, it comes out in many other of his books, and it is indeed one of his better qualities - that ability to see long term treands, and qualities, in the rest of the world, not just the "West".

In the long run, we're all dead. John Maynard Keynes