PC games are some of the most replayable games in the business, because while graphics and physics and stories change, good gameplay doesn't. Look at the 3 games being played in the intel extreme masters - CS 1.6, Starcraft 2, and Quakelive, all which have a 10 plus year legacy.
That's why a lot of console "AAA" are just all flash, no substance. Good games are easy to play, hard to master. Modern games are easy to play...and that's about it.