DUNE is (one of?) my favorite fiction reads and I have to resist turning all "fanboy" over it sometimes.
I love the sensation in DUNE that I'm inside a fully fleshed-out universe where the vision is so large I can't even see the edges, but here's one thread you might find interesting.
...that said...
I never really "got" the rest of the series. Never felt like Paul and his actions were acceptably justified beyond "yeah we would've all died out, trust me".
Separately, the whole, uh, female superpower thing came off as eye-rolling simp-nerd fantasy that wasn't up to the standard of the first book. It wasn't even spice-induced, it was just /muscles/ taking over mens' minds.