I don't know about overall quality of search, but did stack overflow do something to fall out of Google's good graces? I swear unless I specifically include stack overflow in my search query it's either near the bottom or not include at all. Instead it's a whole bunch of articles from independent websites. This is for questions I know fit the bill for stack overflow too. It's almost like Google is artificial lowering their ranking to decentralize the source of knowledge. That or stack overflow lost 70% of readership in 4 months