Really the only kind of game that should sell a console is one with infinite replayability (read: multiplayer). I'm not sure about most people, but once I finish the single player I go right to the multiplayer and that's what makes a game memorable to me. After the missions are done and the dust is settled, I will forget the boss battle in stage two.. but the time I threw a knife across the map and stabbed someone in the eye... that will be forever imprinted in my memory.