I liked Kat's first live performance but, well, the public votes are heavily influenced by coach reaction and she got trashed, so that was the end of her.
I thought Wolpert's A Case Of You had a really good feel to it and a good approach to expressing the emotion of the song, but I felt the execution was inconsistent. Frankly though, just the fact that he chose not only a Joni Mitchell song, but not one of her most famous, makes me like him more. And I do wonder if that's a big part of his appeal, that he resisted the urge to pander. If that is really part of his appeal, he's not going to get into the top few, because that has an expiration date.
What happened with Jonny? Like I said I missed this week's episodes, but I thought he was among the frontrunners. Of course, I couldn't hear him without thinking immediately of Collective Soul and/or Eddie Vedder, so maybe it was his 90s-ness that did him in.