I really like her. I found her an odd choice to "headline" the Nelson Mandela bash as she's hardly a great advocate for peace, but I enjoyed her appearance there and at Glastonbury nonetheless. I can only assume that Amy Winehouse is a love or hate figure; she is not the first and certainly will not be the last artist who is addicted to something. I do think that her addiction adds to her story if you like, how many "greats" would not have been greats if they didn't have some form of tragedy connected to their lives?
I don't think it's fair to slate her for being a bad role model; who says she has to be a role model to anyone? I doubt that when she signed that first recording contract she was interested in becoming a role model for anyone, she probably just wanted to write music and sing.
I'm sure when she is ready she will get clean and her career will take off again, or she will take a fatal overdose and, rightly or wrongly, become an even bigger star.