Hard Candy, American Life and MDNA all sold less than one million copies in the US. And all her singles that bombed on the pop charts:
Holiday
Borderline
Sorry
Get Together
Miles Away
Turn Up The Radio
Spotlight
Oh Father
Bad Girl
Bedtime Story
Human Nature
You must love me
Love doesn't live here anymore
The power of goodbye
Nothing Really matters
American pie
What it feels like for a girl
American Life
Give it to me
Give me all your lovin
Girls Gone Wild
Her last hit was in 2008 with 4 minutes and before that Die another day in 2002. So if the Queen of pop is allowed to have three flop albums (and a couple of underperforming albums), +22 singles that failed to impact on the pop charts, why isn't Gaga allowed to have one underperfoming album? Yes Artpop is a underperfoming album. A album that sold 2.3 million and had two top 10 hits can't be identified as a flop, and that's a simple fact.
Discuss.
Disclaimer: This thread does not have the intention to shade Madonna but to make clear that a artist can have a downfall and still become one of the most successful and relevant acts of all time.