Google's updated official Quality Rating Guidelines have been leaked
  "What does Google want?" 
  If you really want to know what the manual reviewers are looking for, +Jennifer Slegg breaks it down for you here: http://www.thesempost.com/google-rewrites-quality-rating-guide-seos-need-know/

..and here's a link to the doc itself if you want to do some serious reading http://www.scribd.com/doc/217994742/General-Guidelines-1
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