Thanks for the report. I hope the engineers have been working VERY hard. In the past they may have demoted content that was ranking merely artificially, but then they let the door open for a lot of junk to float to the top.
I'm all for limiting the ability to rank well through merely technical aspects rather than offering content of true value - but don't follow that by ranking sites of even lower value than what was demoted. It's been a spammer/scraper playground down on some of the long tail terms