For GPU Power, The PC's are superior no doubt, but for CPU Power, not always. 360 and PS3 both pretty powerful multi-core PPC CPU's running at high clocks (3.2GHz) and add to that, that almost the entire power of the CPU is at the disposal of the game and the developers optimize the game keeping that in mind. On PC, there will be a tonne of tasks running in the background. I don't think a typical < 3.0GHz Core 2 Duo would be any match for that kind of power, but I guess a Core i7 or a overclocked C2Q would be more than a match.
As for Force Unleased, I believe what the developers said is true to a extent, but certainly not as bad as they put it. Havok CPU Physics has been used in many games on the PC already, So I guess you just need a high end PC to run the game in its full glory.