You are completely right. She is an acquired taste. In all forms of the terms. Her voice is atrocious, and remarkably untrained. But you're also right when you say it works.
Take the advice:
If you hated her at first because she made you want to shoot someone, or cut your ears off, I don't blame you. I feel like almost everyone has this reaction. I said "Why the hell does this chick get a record deal? My God!" when I frist heard her. But there was something about her that struck me. Maybe it was her originality, her beautiful harping, her wondrous stories, or all of it. At first, you are blinded (and deafened) by the vocals, and you miss the harp work and lyrics. Go back. Give her 3 or 4 tries and that will prove if you like her.
You just have to get over the intial shock.