Following the thread title, more than the years-ago OP, to "discuss Herbert's works aside from Dune and its sequels," the list I'm looking at may not be complete but it looks like I've read:
- Destination: Void
- The God Makers
- Hellstrom's Hive
- The Dosadi Experiment (weird case of reading the sequel without reading the original Whipping Star)
- The White Plague
- Eye (collection)
All I can say (because I don't remember most of them specifically, but agree with Snowdog on
The White Plague) is that if it weren't for
Hellstrom's Hive, I'd think
Dune made Herbert a one-hit wonder. To me, he writes a clotted prose that's hard to get into (thick, heavy, awkward) and, while idea-filled, his tales don't have much else (and it usually takes very little else after ideas to win me over). I don't recall the novels being especially bad, but just not particularly good. (Perhaps because the deficiencies are magnified in relation to the smaller scope, his short fiction is worse.) I don't even recall
Hellstrom's Hive that well but I think it had a much tenser, zippier plot than usual. As TedKeller indicates, it's more thriller-like SF.
I did pick up
Under Pressure aka
The Dragon in the Sea aka
21st Century Sub years ago (I think after reading or re-reading Clarke's
The Deep Range and Clement's
Ocean on Top and maybe Allen Steele's
Oceanspace and wanting another underwater adventure). I'm hoping it will either be less clotted than Herbert's usual or that that style will serve the story in this case. Sounds cool, anyway.