Naughty Dogg, Guerrilla games and Inzomniac put most other PS3 Devs to shame IMO.
Guerrilla Games:
Killzone2 - No install. Huge online component. The game runs and looks amazingly.
Slant6:
Socom Confrontation - 3GB+ NON-Optional install. That shit has horrible lag. Even the menu's feel like they're lagging. And it doesn't look near as good as KZ2 or Uncharted.
4 ≈ One