I personally find myself spending more and more time on filtering results that I know (or think) is SO scraped content. Google should make it possible to flag other sites' content as duplicate of that on your own site (of course they need to verify that it actually is duplicate), so that sites going to extremes in terms of scraping will get degraded in the results. I guess Google has (long time ago) lost the human touch, and is increasingly becoming a system to beat.