Look, I'm a big fan of the original Dune series (not of the mess Frank Herbert's son did after his death in order to make money out of his father vision - those books actually ruined a bit of the originals for me, I actually suggest that you don't read those).
I tried to love the son's prequels but couldn't and therefore I second your comments. There were many mysteries within mysteries in Frank H's series that weren't present in the followons.