Zero Angel
Auror
How many authors other than Tolkien are known first and foremost for world-building and not for storytelling and/or writing?
Apparently, Sanderson markets himself (or I should say his publisher markets him) as a "master of secondary creation in the same vein as Tolkien" (I'm quoting from a book jacket that I am recalling from memory, so I may be off slightly on exact words).
So there's one!
I'd say Weis & Hickman, Norton & Lackey and Anne McCaffrey are known more for their worlds than their writing and definitely George Lucas as well.
Even so, writing has to be momentous for you to really remember it. You have to have the exact perfect lines and words and delivery for you to quote something directly. In other genres, it is easy to remember story, but in the speculative fiction genres, world-building frequently interweaves with story and is yet another thing that is easy to remember and notice.
Nowadays I find myself in the position where I will go back to re-read old series and be beyond annoyed by the writing of them. This has happened to me recently when I went back to read the Halfblood Chronicles of Norton and Lackey. I loved the world and the ideas, but the execution frustrated me. I found myself skimming entire pages to get to the next "goody" I remembered. (Yikes! Didn't know Andre Norton died...or that she was 93!)