Releasing Radar on the circus era instead on the blackout era (It was more her label's mistake but still)
That marriage she had before that only lasted like a day
Releasing Video Phone as the last single of IASF instead of Radio which was an obvious hit because she sings about being in love with her radio. I mean radio would play the **** outta that. I remember in Holland, the biggest radio station there played the **** outta that song and used it for their commercial.
Look this was the commercial.
It had SO MUCH potential. And with Gaga being on it, it would've ****ing slayed so hard.
She ain't my fave, (she used to be) but Leona Lewis's worst mistake (by FAR) is not releasing Scene of the Crime as the lead single from Echo, and not even including it on the album.
I might have continued stanning for her if she released that.
Nelly Furtado - releasing a spanish album and then another long waiting for a new english one (even though I unterstand why she did it - she wanted to make high-class album not some rush released juvenile mess)
Avril - lack of communication with fans, many delays for Goodbye Lullaby without explaining why; crossing into poppy-bratty-girly style in 2007 (TBDT).