1. Madonna barely has singing or any kind of musical talent, including writing her own.
2. Her last innovation was also her first, when she started in the early 80's with that fresh style and music.
3. Doesn't know how to grow old gracefully because her heyday was when she was young and is stuck there.
4. Can't act at all because she totally lacks any imagination or personality
5. Can't create artistically because she totally lacks any imagination or personality
6. To make up for what she lacks as an artist, she: a) uses ("shocking") publicity stunts, b) became a Buddhist from being a Catholic and back, c) exercises her body to a freakish level because she doesn't know how to be older and is obsessed with being a "powerful woman", d) took Britney Spears under her wing because Britney is at least as mindless as she is and has the same no-personality.
After "True Blue", she started becoming boring and tiresome. After "Vogue", she became completely worthless.