Yeah, not imposing any kind of quality on questions definitely gave Quora a distinct unturdlike quality.
"What are some things that make you really sad?" - real world example from this week's Quora Weekly Digest.
http://www.quora.com/Sadness/What-are-some-things-that-make-...
For example, my most recent weekly digest does not have "What are some things that make you really sad?", but does have "What are your favourite quotes from Harry Potter?" -- it often seems to include Harry Potter. Maybe not a very great question, but it does fit my social network's reading interests pretty snugly.
http://www.quora.com/Sadness/What-are-some-things-that-make-...