well, quite simple really: more easy to transport to friends' houses, don't need to set up controls, and it doesnt take up as much space, and...some of the games you may like on it, are not available, or are quite lame on, pc....for instance, have you (legally) played soul calibur 2 on your computer? Some games belong on consoles, others belong on PC.
It's always been about the games to me, not which console's bleep is bigger. -_-
Battle is a pure form of expression. It is heart and discipline, reduced to movement and motion. In battle, the words are swept away, giving way to actions-- mercy, sacrifice, anger, fear. These are pure moments of expression.