Sebastian Coe.
Srsly. Olympics went pretty well, he was directly responsible for the management of most if not all of it. He's also as it happens (by all means google him) a fairly unobjectionable guy.
Elsewhere not a lot else went very well. 2012 has been pretty shit.
Edit: I know time doesn't pass moral judgement, but I struggle to think of any one person who's had more impact in a tangible way.