Consoles = Great in-person multiplayer, Affordable, and generally and all around good system for someone playing games casually.
PC = Surpasses all consoles, more for the computer "enthusiast", more upgradability, but in the end MUCH more expensive.
So lets just conclude that for the average person they will not need anything more than a console (PS3 or Xbox360). This is also the best Bang for the Buck Deal. And, well... comps are always going to be the best because of their frequently changing technology. End of discussion