Game Stock Car 2012 for me too. Not only did Reiza create a fantastic sim, their support to the sim community has been outstanding; to release an entirely new version for free including new tracks is generous beyond comparison. Physics and FFB must rate amongst the best currently available or at the very least, the best we'll see from the ISImotor 2.0 engine. Sounds for the most part are brilliant too.
On a slightly negative tangent, F1 2012 doesn't deserve to be GOTY as any title that requires 12 patches and still has issues doesn't deserve any gongs at all. It is a solid game but Reiza's efforts trump it in every way (in my opinion, naturally).
WRC 3 deserves a special mention as Milestone really took on board the shortcomings of the 2 previous WRC games and made a concerted effort to make WRC 3 a better game all round. It won't poll highly here as it's still not as realistic as RBR but as an SBK player since SBK 2001, it's great to see the old Milestone back.