The 'Grey's Anatomy' is full of doctors, and recently they were ranked from best to worst. Fans ranked Dr. Izzie Stevens as the worst doctor on the show. According to screenrant.com, "From her careless decisions with her patients, to the frequent drama she creates with her fellow doctors, Izzie?s skills as a doctor don?t match up with the rest of the cast. This makes her one of the weakest doctors on the show." Richard Webber is ranked as the best doctor. "Richard proved his skills as a surgeon early in his career... He is the Chief of Surgery at Seattle Grace, and he remained in that position for many years."