I've never tried to participate in Stack Overflow as a hyper-active question answerer, but as a sometimes-user of the site who ends up there via Google often when performing coding question searches, the site still suffers from what has been dubbed "The Fastest Gun in the West" problem. I can usually find answers that are at least a useful starting point to solving my core problem on Stack Overflow but they are very often not the top ranked answer and are often way at the bottom sitting with a 0 rating due to having been posted "long" after the question went live (and by "long" after I usually mean like the next day). The top rated stuff is often superficial junk answers that just happened to be the best available when the question was still a hot one.
So I'd argue that even from a non-poster's view, the site is broken (because I have to dig through it more than I should have to) though still ultimately useful.