Tonight's my first time back in this forum in a few months, but I've noticed that there are no Dune discussions...
It's one of my favorite series. I'd always wished that Frank Herbert hadn't died so that I could read about what happens after Duncan flees from the Bene Gesserit/Honored Matres and how the Face Dancers were slowly moving in from the uncharted areas outside the known universe to conquer everything.
I think that the prequels were well done and had the same feeling as the original series, but Brian Herbert did have his father's notes, and I have a feeling that he may have been involved in some of the later writing of the original saga. I didn't read the great house books, but I loved the Butlurian Jihad... It explains so much about the world of the original series, though I do wonder what will become of the Omnius probes launched from Ghedi Prime in the first book of that series...