I'd love to say Valve (have they made a duff game yet?), but I can't due to the unreliable releasing of games. You can depend on their games to be awesome, but you can't depend on them to release them in a good way. xD

Bungie have made good games (okay, I've only played Halos. But apparently Marathon was cool?). Their customer support is pants, although they do throw a tonne of stuff at their consumers to make sure nobody complains about the ty support. So it balances out.

Sony gave me SotC. I don't care about anything else they've made, good or bad. SotC, baby. SotC.

Squaresoft gave me FF9; the only game I have ever played literal dozens of times and 100%ed about half of those. Even Square are alright. Though I'd definitely say the magic is gone, the game are still good enough.

If Bethesda would get off their asses and gimme ESV, then I'd create my own site called "PeniiOnES.com" and have it with only one forum; the suck Bethesda cock forum. But even without that inevitably magnificent game, no one can deny that their more modern games like Morrowind, Oblivion, and Fallout 3 are amazing. Then again, Brink. So...yeah, swings and roundabouts.

I couldn't really pick a developer. They've all got naff games and good games, and it's not just the games that count anyway. I prefer to judge a game by the game itself, and just leave the developers alone. xD