In 2013 , `` TV Guide '' ranked it 5th in its list of the sixty greatest dramas of all time , and it was ranked seventh in a list of the 101 best-written TV series of all time by the Writers Guild of America .
In 2013 , `` TV Guide '' ranked it sixth in its list of the sixty greatest dramas of all time . It was ranked seventh in a list of the 101 best-written TV series of all time by the Writers Guild of America .