You can't argue with the last two races. While the rest of Vettel's season was marked with inconsistancy, the fact that two weeks in a row he came from literally the back of the grid to score good points, enough to finish the year three points ahead of Alonso, to me means he is deserving of this year's titles. Coming from the back as he did were both champion's drives, and the net result on the rest of the year makes him champion for 2012.
A worthy champion for a great year.