"They sound horrible"
Zero talent.
and
http://www.youtube.com/watch?v=0_RnNQA_yok
They actually play their instruments (violin and guitar) fairly well, but once the singing starts, well, it's just not good.
That didn't stop Ashlee Simpson.
To be fair, they're the most talented neo-Nazi musical group made up of pre-teen identical twin girls I've ever heard. Which is kind of like saying that I'm the best dancer in this room right now (for the record, I'm here alone).
It's kind of like watching a bear juggle. It's not amazing because he does it well. It's amazing that he does it at all.