Dune, sure, I get it (especially when his son took over). Hyperion though? If you count both parts as one series it's 4 books. Even at pretty respectable page contents, they don't compare to a series with 11 (? or more) books, many of which came pretty close to 1000 pages!
It did get a little weird there at the end, but still pretty good books. And nowhere near as bad as WOT, or hell, not even as bad as the Sword of Truth series.