Your typical architecture astronaut will take a fact like "Napster is a peer-to-peer service for downloading music" and ignore everything but the architecture, thinking it's interesting because it's peer to peer, completely missing the point that it's interesting because you can type the name of a song and listen to it right away. I feel a bit like StackOverflow has extrapolated from a huge pent-up demand for decent…
I treasure and trust StackOverflow for my programming questions precisely because of the elitist, purifying attitude. I'm confident the answers are vetted and the best has risen to the top. I'm a self-taught programmer with only a few years under my belt, so this resource is valuable. As for the other Q&As...especially the non-engineering ones, this culture is counter productive. In a field like history, the experts…
That really doesn't have as much meaning as you think it does. The best answer out of three bad answers is still a bad answer. If they have driven away the people who give good answers, no amount of filtering the leftover bad answers will get you a good answer.
I don't see very many experts on stackoverflow. It may be a useful resource for beginners, but as someone more intermediate, I've had no questions answered satisfactorily in the time I've tried using it. And all those questions I ended up getting answered by asking in the appropriate IRC channel. My concern is that more and more open source projects are saying "if you have questions, ask on stackoverflow", but not actually watching for those questions and answering them. When a project has no mailing list, no IRC channel, and says "use stackoverflow" I'm pretty much out of luck for getting help.