We manage PPC accounts for about 50 companies and up until now Quality Scores haven't been a big concern. This past month though we are starting to feel a little victimised as Google is throwing us some low QS marks for seemingly random stuff.
One advert for example is getting a 2/10 for keyword relevance on "blue widget london" even though the ad is like this:
Blue Widget in London
Word word word word
London based Blue Widgets
Seeing similar across a few client sites.
Come on Google, give us a chance.