The Games That Define This Generation

I recently watched a video on IGN where four of the site's editors discussed the question: What game most defines this generation of platforms?  Of course, there's no easy answer.  Would it be Modern Warfare, the game that sold millions of units and is probably at least partly responsible for the recent burst in shooters, or would it be another one of the increasingly huge blockbuster games to have graced this console cycle?  One could make a good argument for World of Warcraft, the MMO juggernaut that continues to deliver massive expansions and boasts over 10 million users.  Maybe it should be Wii Sports, the game that launched the motion control craze that even Sony and Microsoft have hoped on board with now.  Could it be Minecraft, the indie hit that embodies player control and creativity?  What about Angry Birds, the casual game that defines casual games in an era where the sales numbers for casual games are far surpassing those of games released on consoles and PCs and are reaching a far wider audience?  The games in the Angry Birds Series alone have seen over 1 billion downloads worldwide.  Personally, I think the field has become far to vast to pick any one game.