I would say IA...SF comes close to The Fame success.
Mess no Even without The Fame Monster Gag could have kept releasing singles from The (Fleeting) Fame, Starstruck and Boys Boys Boys were ready to smash. He could have shifted 8-9m albums easily. If Fame Monster would have been a separate full album though with more songs (add Nothing On, Out of Control and Reloaded) and 5-6 singles, then The Fame would have likely stopped at 6-7m while TFM could have done 10m tbh. She was so flawless and massive in 2009-2010.
After Beautiful Stranger, American Pie, Music and Don't Tell Me I really despised her, I just hated all those songs so much. They erased all my good memories of her. Then WIFLFAG video and remix redeemed her.