I noticed a couple websites showing up red in McAfee siteadvisor, so I checked them out and found that they do have misleading information. Not really scams, but not very honest in my opinion. So I filtered them out in my adsense account. Does Google perform any type of screening for sites buying keywords? I'm just wondering if I should be paying more attention to what sites showing up in my ads. It may be tough since ads are random, but I sure don't want scam websites advertising on mine.
Yes, a lot of sites are just crap and a complete scam. Use the competitive filter to block some of them. Good luck!