I think Joe endeared himself to the public because he took criticism with a nod and smile (not like Debbie McGee who would raise her eyebrows with a hint of "How very dare you!"), he worked hard - but without an air of desperation to win - and he danced well.
I loved the Cabaret dance because it showed a different side to him; as much as I love his smile, it was interesting to see him nail the camp, slightly sinister MC.