Her music and voice acting. She is a beautiful woman, but I feel she tends to over-act with her expressions and mannerisms. However, I think her voice over work is perfect, especially considering it seems kind of good to over act with your voice in animated features.
As a Mandy fan, I have to agree that she overacts sometimes, mostly in comedies. I think her role as Jamie Sullivan was pitch perfect on key. She carried the subtleties of innocence and dramatic aspects of the character perfectly where as her turn as Lana in Princess Diaries was so exaggerated to me. It was so obvious that she was trying to come off as a bitch in that movie, where as in Saved! her bitchiness felt a bit more natural.
JMO.
Razzie Winner Halle Berry: If you can't take criticism then you're not worthy of praise.