I love how doctors are the profession most insecure about ratings systems. Deal with the times. You can rate your dentist, your lawyer, post about your experiences on the web, but god forbid if somebody dares to criticize the saintly physician.
But more importantly, sites like this dont' matter. The vast majority of people don't research their doctor on the net, they just show up and take the first availability. Remember, most patients are elderly and have low socioeconomic status. Not exactly the type that are savvy around the net.