Christina cleans up well, but her usual public image is too "anorexic crack whore" for me (the nose- and lower lip-stud do absolutely nothing for me).

I agree she is a better singer, and has a better voice, than Britney, but that's not much of a compliment. And I don't care for that kind of music. Too prepackaged and just plain not good. When exactly did songwriting die as an art form?
I agree, though, that someone in her position faces a lot of resentment (for her looks, for her sudden success, and the fact that many attribute her success to her looks, which is true to a large extent), and is in a position where it's hard to trust anyone, because so many people want to take advantage of her.
It's a sad reflection on our society that we demand "superstars" to the point where the media is compelled to create them where they aren't. Society then blindly allows itself to be spoonfed what the media tells it, and then demands so much of these media-created "successes" that they break down under all the pressure. And then society can't understand why they can't deal with what it views as the sweet life (money, fame, success).
That being said, however, Christina's obviously not the sharpest tool in the shed, as evidenced by a quote from a USA Today article about a month ago, when she said that she and her boyfriend broke up on "kind of a tragic day," that day being September 11, 2001...