I was mulling over asking this question yesterday, because in various discussions around here, people were saying "subjective can't work on StackExchange", "it wasn't designed for that", etc. Whereas, to me, the fact that StackOverflow discourages subjective questions doesn't mean that they couldn't work elsewhere.
Now Robert Cartaino has blogged on this subject.
I wondered what the rest of the community makes of this. Can you see his 6 criteria working in practice?