Naughty Dog, EASILY. The whole Uncharted trilogy is absolutely spectacular. Sadly, I still haven't played The Last of Us.
Honorable mention goes to Rocksteady, which managed to create two of the best games of the generation - licensed games! Crazy!
Also, Sucker Punch actually impressed me with inFamous - great gameplay, and an entertaining plot with surprising plot twists. In fact, Sony's studios as a whole have produced some excellent first-party games. LittleBigPlanet, God of War III...
Sales-wise, the obvious choice is Infinity Ward. They've turned Call of Duty into one of the biggest gaming franchises ever. Considering the fact that CoD4 is not even 6 years old, it's really impressive.








