In SharePoint 2010, Microsoft promoted FAST for a better search experience. But for most SharePoint users, FAST was just a new road to the landfill, because their SharePoint platform had inherited the bad habits that previously plagued users of shared network drives. As people lost interest or left the organization, documents and data got stale. Abandoned content piled up deep and wide, and the volume of redundant content across sites eroded the authority of a search result. Your chances of avoiding junk were about as good as winning the lottery.
Stick figure style from http://xkcd.com