Great performer, fantastic career. Although I think she should bow out gracefully now .
Comparing Madonna to some junkie wench like Amy Winehouse is like comparing chalk to cheese,Winehouse will probably be 6 feet under by the times she's 30 if she keeps going the way she is!!!!
She might not be everyones cup of tea but it cannot be denied she is a fantastic perfomer and her "longevity" in music speaks for itself.