Could the Xbox do it? Probably. Do I want it to? Hells no. Could it be done on PC, where the smoothness and complexity of Kratos' etremely fluid actions would be broken up by keystrokes and clicks? Name an actually complex hack and slack that really works on the pc for any kind of intelligent combination-attack system. It's fluid on the PS3, it was created specifically for the PS3, and it's entire design/control/action/attack/nosepicking scheme was built from existing schema, for the PS3. To me, it's a bit like asking your toaster to refrigerate your tuna salad--you might be able to get it to, with a bit of tweaking, working, and a few modifications, but why go through all that when there's a perfectly good fridge right next to the damn thing. I find it interesting that people keep using examples with less profound lighting than even the PS2 (which, by the by, still had the untapped power of Sony behind it, something few 3rd party devs could wrap their head around). It's an in-house build, and it's looking to be a damn good build, with little Microsoft opposition, so Yeah, why not, It could very well be a system-seller.