The first half was great, which made the second half seem even more terrible than it was. At the same time, there was the release of the Giger Dune artwork, the "illustrated encyclopedia" of Dune which the movie was riding that same wave, that crashed with the last books: Heretics, and Chapterhouse, though tbh even God-Emperor was more of a stand alone novel, and that the original trilogy was best. But yeah, going back to the late 70's, early 80's Dune was a franchise, there was even and avalon hill board game:
Dune