aristotle - 4:44 pm on Jun 16, 2013 (gmt 0)
At one time relevance, quality and usefulness were major factors in Google's ranking algorithm. But these factors were an obstacle to Google's goal of getting big brands and big organizations to the top of the search results. So in order to achieve its goal, Google had to greatly reduce the importance of these factors in the algorithm. In a nutshell that's why Google's current search results are so bad.