I was glad what Simon finally left Idol as he went out of his way to be needlessly rude/nasty/mean to the contestants and then acted surprised anyone took exception to his behavior. Whether it was an act by him encouraged by the producers or he was truly that clueless doesn't matter to me. You can critique someone without doing it in such a condescending manner.
Voice has always been much better at only bringing truly talented singers to the show. The way the coaching is done is also an integral part of the show and part of what makes it interesting to watch.