INSOMNIAC GAMES. I have loved them since I was a kid playing my first PSX game, Spyro the Dragon. I even enjoyed Ratchet: Deadlocked despite the sudden genre shift.
I wish I could say Kojima Productions, but fuck MGS4 and its passive aggressive hate of its fandom. Every other game Kojima and his team did, I loved.
Clover was amazing while it lasted, Naughty Dog was great (though I have yet to play their PS3 games), and Sucker Punch made one of the best platformer series ever.
But mostly Insomniac.