Does Google use a set standard for manually removing webspam?

When Google does a manual review do you guys use a “set standard” when banning (removing from the index) sites or do you guys ban based on if it “looks bad” or even smells like spam? Billy, Sacramento Read our quality guidelines: support.google.com Learn more about how Google fights spam using algorithms and manual action: www.google.com Have a question? Ask it in our Webmaster Help Forum: groups.google.com Want your question to be answered on a video like this? Follow us on Twitter and look for an announcement when we take new questions: twitter.com More videos: www.youtube.com Webmaster Central Blog: googlewebmastercentral.blogspot.com Webmaster Central: www.google.com