Comment by Matt_Cutts

I recently talked for about a minute about the topic of "too much advertising" that sometimes drowns out the content of a page. It was in this question and answer session that we streamed live on YouTube: http://www.youtube.com/watch?v=R7Yv6DzHBvE#t=19m25s . The short answer is that we have been looking more at this. We care when a page creates a low-quality or frustrating user experience, regardless of whether it's because of affiliate links, advertising, or something else.