[ShadowMarth]

The particular efficiency of the game engines has a lot to do with it. I sincerely doubt that any engine ported from PC (See Unreal, Source, Quake, Crysis) would run as efficiently on a console. So naturally, a console-exclusive developer can squeeze much more out of the box. Doesn't much matter though, since new PCs already come with better hardware than consoles in most cases.