So it seems this is an understandable case. Google not only rank but also filter pages based on text of links pointing to them. This has been going on for a wh

So it seems this is an understandable case. Google not only rank but also filter pages based on text of links pointing to them. This has been going on for a while, at one point before Obama, searching for a "a miserable failure" got the White House as first result. But this cannot be the entire explanation for why so many results are useless?