Google says that do not display play important role in the ranking algorithm

There was much discussion around the Google farmer update, that display a role play.

Meaning, if you show too many who can look at Google, as a sign of the low quality of the content and insert your ranking for the site as a whole.

Vanessa Fox mentioned that article says it as well in their lessons learned:

Matt said that have advertising on your website by nature of its quality is not reduced. However, it is possible to overdo it. I had noted in my previous article about this change, that in particular no content and only display of the fold, as well as pages that display as many have, it is difficult, a poor user experience is often to find non-advertising content.

That being said, Google's JohnMu said only it in Google Webmaster help thread says:

Another factor, the destruction is mentioned - map. Do not display normally important play for our algorithms. However, they can a role with your visitors.

Forget the user page, said John in Google algorithms map "not playing a major role." They play a small role? Is it about the content of the ad ratio? Or it is implied that websites with many display usually lower quality content have? There are so many ways to read it. Probably the best way to read it, like Vanessa above is said.