Not about her singing specifically, but remember the Grammys when they won Best New Album or whatever award it was they won? She hogged the microphone and went on and on about herself, gushing to "her" fans about how they had made all the difference, and whining about how the radio stations hadn't wanted to play stuff by "a chick with a piano."
Apparently she forgot that Norah Jones took home multiple Grammys the year before.
That said, I love their first album, haven't listened to the second one, and she needs to get a grip on reality.