I thought the results in US shouldn't have been changed. But certainly this change has have some effects on good sites.
Google kids with PhD are not GODS they can make mistakes as well. And I am in this arena for so long and when I see results for 45 or so queries all being exactmatch/stolen/script generated content dominating the results then I know something is wrong.
What is even more weird is that their Analytics/Webmaster/Adsense is totally broken past 2-3 days nothing matches.
Lets hope it will be better.