Even if driving-wise he would have also earned it, I am glad that Fernando's self-propaganda this year was not rewarded, I am not sure how Jenson won it over Lewis though... this was probably Jenson's weakest McLaren year. Heck, I would have nominated Lewis for DotY.
Here's an excellent analysis of the speed of the the 2012 teams. McLaren come out first, no surprise there. However Ferrari were actually quicker than in 2011, also Lotus were quicker than them this year in qualifying trim yet only achieved one race win to Ferrari's 3, looks like they know when to take their chances.