I preferred The Dune Encyclopedia take on the Butlerian Jihad (actually I preferred reading it to reading the actual books most of the time).
I love the characters, the universe, the storylines of Herbert Snr's books but the actual books were a bit turgid in my opinion.
It would make a great hypertext project.
I wish the Herbert estate would let the fan-film adaptation see the light of day.
I just didn't get the Anderson books at all, even the storylines on there own don't fit.
Actually trying to read them is like watching a film based on historical events with the facts really wrong, taking itself very seriously (like U-571 or worse still Braveheart) compared to something like I Claudius which may have bent the facts a bit is an astounding piece of drama or Cromwell which is very accurate (if you ignore the exploding cannon balls).
The tone is way off too.