She wasen't too good live when she started out. Early on, it was embarassing, almost... she couldn't sing in tune, she ran out of breath all too often, etc. But she's gotten better - and what everyone seems to forget is that she was just starting out back then. (Who steps up onstage for the first time ever and puts out a flawless performance?)

Her live DVD that came out not too long ago I find rather entertaining, actually. She's gotten a lot better live.