I'm being told they are showing up a lot on our health supplement site. I don't think our readers are interested in opening Google Adwords Accounts. They are often reading about weight loss at the time.
I sent out an email to my friends and family asking them to look at (and for heaven's sake not click!) the ads on the page and say what they saw advertised. More than half said an ad with a google logo showing e.g. Adwords.