The problem with this situation is that Madonna is so iconic, that even her as you call them 'flops' are more remembered than most artists successes.
Holiday
Borderline
The Power of Goodbye
Hung Up
American Pie (to an extent)
What it feels like for a girl
Human Nature
Give it 2 Me
Girl* Gone Wild
Like her debut album also includes Lucky Star & Burning Up.
Emmmbarassinnggg yourselves guys
The delusion lives