I am also reading through dune right now, I'm enjoying it so far. I was fine with the world building, partly because I really liked the sets in the movie and also because I found it novel compared to the very generic space faring stuff or Tolkien rip-off you get as a backdrop in sci-fi and fantasy respectively.
I'm also really enjoying a lot of the environmental musings in the book, after I finish it I will look up more about Frank Herbert's relation to these topics, I get the feeling there's something about it.