See, this is why I would argue against dropping Carrie & David from the judging panel. They know, better than anyone else, how much a person has improved.
Gina? IMO (and I'm sure I'm in a minority) not funny, not really trying, and a bit too OTT. Flat and dull when trying to sing.
Jon? Terrible, awful, awful, awful on Saturday, but the last two nights he's been so much better - I actually really enjoyed From Russia... As he's an impressionist, I imagine that the reason he improved so significantly was that he actually listened to what he was taught. Is it significant that the vote he got was from Leslie - the trained singer? I would like to think so.
Plus I think he's very funny, and very sweet.