In the UK. For one keyword I've slipped from page one to page three. I now have lots of images, news articles eg Daily Mail and videos ahead of me as well as sites that obviously I think I'm better than but they are decent and relevant sites so i can't complain.
However I'm also now outranked by:
An old US site that is nearly all pictures and the keyword is only mentioned twice on the site and the site content is not remotely connected with the keyword.
An obscure amazon product page where the keyword is one of the words in a title of a song
A site about giving birth - the keyword is used in the title and the text but really no one would be looking for a site on that subject by typing in just the keyword
A livejournal subdomain old site where the keyword is in the title and nowhere else. Again not relevant to people who just search the single keyword.
An article on a good site about some US legislation and the keyword is in the title but again not relevant to people who just search the single keyword.
So for whatever reason my site took a hit, the resulting serps are a mess. This tells me that even if Google did some good work with this update, what they've left behind as it is at the moment is not what they would want.