I always dug Lady Sybil. <3 Political but dignified, kind and thoughtful. She was by far the best of the sisters. I don't know which of the other two were the bigger ***** over the course of the show - they each tried their hardest.
Mary was obviously in need of a pair of balls - God knows she earned them! Machiavellian to a fault. And Edith just got bulldozed by her, it was pretty sweet at the end when she told Mary off. I love that show!