I would agree that Dragon Age is an excellent game. I took the time before 3.3 to play through and beat it for the PC. I would also say get the game for PC over any of the consoles. That being said there are some excellent PS3 games out.

Killzone 2 (FPS)
Infamous (Third person action)
Modern Warfare 2 (FPS)

I have enjoyed/enjoy those three games tremendously. Also I have heard nothing but good things about Uncharted 2: Drakes Fortune, but I have not played it myself.