As much as I like her vocals, I have to admit that when she does that bow-legged stomping thing I do want to grin.
As for the coaches performing, I've always enjoyed it. I guess it's because these celebrities actually spend time with contestants, and it looks like they really care about them. OTOH, it always seemed phony on AI, because you knew people like JLo and Tyler were just sitting there spouting platitudes to further their careers. That's why I never watched those videos they made.