I love to read these kinds of posts rather than the whining boy moan stuff (a great van morrison song).
Food for thought. I think it's in google's long term interests to "be concerned with the quality experiences related to their ads -- on the adsense side (MFA issues), and adwords side, no matter where they occur.
Ad blindness and the credibility of the brand, ads by gooooogle are involved here. I think google knows this. I think google WILL raise quality bars as it is both technically and economically feasible over the long haul.
My guess is they will move on the larger quality issues within the next twelve months and there's be a whole lot more people on adwords and adsense who are going to get "slapped" -- in essence the bottom feeder lower value folks.
It's going to be a HUGE competitive advantage, which leverages their time advantages they have now. MSN can't deal with quality issues. Yahoo is planning to, but they are about one year behind now. Google is going to stretch their lead and be recognized as THE premium place for advertisers and publishers, even more than now.