[Jack_]

I personally don't think she was out of tune. Not the strongest vocalist, obviously, but she wasn't out of tune. And to answer your question - it's their opinion [one that they're entitled to]. That's the whole point of having Judges, for them to give their opinion. Not everyone is going to agree with it, and if all the Judges agreed with each other/the public it would be a very dull show and would render the Judges pointless...