No, it's the worst for me not because it flopped. It's the worst because it's my least favorite among her singles. Btw, DWUW flopped harder than Applause but it's one of Gaga's best for me.
Can't think of any from my actual faves. Maybe Eat the Music for Kate Bush.
From my pop faves, Beyoncé's would be Baby Boy and If I Were a Boy, awful songs imo.
Probably Born This Way, even though I love it. I just still can't wrap my head around how they chose it over Marry the Night as the lead. Also, You and I should have never been a single outside the US/Canada.
Because it's a very good song and represents the entire era. That's why!
Rejoice and love yourself today 'cause baby you were born this way.