We've talked a lot around here about Google using user metrics to rank webpages. It's certainly an approach that would make sense, but it also opens a few questions. Assuming Google is being truthful when they say they don't use Analytics data to rank web pages:
--What data could they be using to gather user metrics? Adsense? Chrome? Cookies from the Google search page to see how long searchers stay on a SERP before clicking back?
--Exactly what metrics could they be gathering from their sources, and which metrics would they not be able to access?
--Once they gather these metrics, how are they interpreting them? For example, can they tell the difference between a bounce that happens because a visitor got all they wanted from a site and a bounce that happens because the searcher didn't like the page?