My opinion: first and second places were right, but third and fourth were not. But it's all about the fan base, and Jacoby's was bigger than Ally's.
I think one of the reasons I was able to support Ally was that Mark's attitude was much better this year. I used to get so tired of his cockiness and disregard for the rules and judges' opinions, but he acted much better this year. And it seemed like he was dancing with Ally, instead of outdancing her like he's done with other partners.
As for Derek, I've been irritated more than once when he gets away with breaking rules, but again I didn't see it this year. And after the freestyle he designed for Kellie, he deserved to be in the top spot this year. Of course, Kellie had a little something to do with it as well.