Achievements. Everybody wants to have that larger number of points then their friends or people they met on Live. As in example, if you go to a game store (and have the Xbox 360 & PS3) and spot a COD 4 on both systems, you would get the XBOX 360 version. Because you want to boost your score. Achievements is great idea that Microsoft made, it actually gives you a reason to play games. It identifies what kind of a gamer you are: a bad one, a good one, or a god. (As a person that does not have the PS3, I do not have a reason why my gamer-score is low, except that I have not had the time to play video-games or probably is not a good of gamer.)

My advice, Sony and Nintendo needs to follow in Microsoft footsteps. Maybe it doesn't need to be achievements, it could be points on how well you play. Gamers will love to play games for a reason.

Happy New Year