For the sheer number of games they put out that held my rapt attention for at least a hundred hours apiece, it's Nintendo for me. Brawl is my most-played game this generation, the Galaxies an Donkey Kong (second party) were transcendent, the Wii Sports games were brilliant for parties, and I effing loved slicing up fools in Skyward Sword.
Second place goes to Quantic Dream, whose one spectacular game (so far) single-handedly justified my $600 PS3 purchase.
Honourable mentions to:
Rocksteady!!
Epic Games
Naughty Dog (only for TLoU, though)
BioWare
Bungie/343 Industries







