I agree with you regarding the quality of his writing, but your generalizations regarding worldbuilding's relationship to quality may be overbroad or overstrong. Worldbuilding is fun and interesting and I like it in my books, but lack of worldbuilding, or deep difficult holes in the world are not killing flaws. Almost nothing cannot be rescued by a sufficient quality in other areas. Consider Madeline L'Engle's A Wrinkle in Time, Gene Wolfe's Book of the New Sun, Stanislaw Lem's Cyberiad.
The only one of the books you mention that I've read is Wrinkle in Time, so I'll address that one. It isn't world-driven! It's a strongly character-driven story. The planets she invents, the species she imagines, the settings she dreams up - these do not supply the thrust of the story. The people populating the book do that, and pretty, emotionally-charged prose does most of the rest. Further, L'Engle's worldbuilding isn't awful, and moreover, its weaknesses aren't distracting. It has an element of whimsy to it and it's colored by her background valu...
As promised, here is the "Q" part of the Less Wrong Video Q&A with Eliezer Yudkowsky.
The Rules
1) One question per comment (to allow voting to carry more information about people's preferences).
2) Try to be as clear and concise as possible. If your question can't be condensed to a few paragraphs, you should probably ask in a separate post. Make sure you have an actual question somewhere in there (you can bold it to make it easier to scan).
3) Eliezer hasn't been subpoenaed. He will simply ignore the questions he doesn't want to answer, even if they somehow received 3^^^3 votes.
4) If you reference certain things that are online in your question, provide a link.
5) This thread will be open to questions and votes for at least 7 days. After that, it is up to Eliezer to decide when the best time to film his answers will be. [Update: Today, November 18, marks the 7th day since this thread was posted. If you haven't already done so, now would be a good time to review the questions and vote for your favorites.]
Suggestions
Don't limit yourself to things that have been mentioned on OB/LW. I expect that this will be the majority of questions, but you shouldn't feel limited to these topics. I've always found that a wide variety of topics makes a Q&A more interesting. If you're uncertain, ask anyway and let the voting sort out the wheat from the chaff.
It's okay to attempt humor (but good luck, it's a tough crowd).
If a discussion breaks out about a question (f.ex. to ask for clarifications) and the original poster decides to modify the question, the top level comment should be updated with the modified question (make it easy to find your question, don't have the latest version buried in a long thread).
Update: Eliezer's video answers to 30 questions from this thread can be found here.