I love Dune and personally it is the best Sci-Fi Lit out there.
I think the best comparsion I ever heard was: Lord of the Rings-Best Fantasy/ Dune-Best Sci-fi
And the originals are so so good, but I love the new series as well. I do not even consider them all one series really.
His son and Brian are doing a good job, and yes it is different from Frank, though its not horrid.
I am just glad someone is continuing the Dune legacy otherwise I feel like there would always be something missing.