Retro for me has to be the Sega Megadrive!
Different games suit different consoles.
The Playstation 3 is the odd one out though ^^
Xbox360's Own games Include, Halo 3, Gears of War, PGR etc
The PC's own games include quite a few good ones, Too many to list.
Retro games.. Are just awesome, so no need listing them.
But the PS3.. The only one I can think of is Gran Turismo..
Anything else? In order for me its,
Xbox 360, PC, Retro(Sega) then the Playstation 3..