Gwog mentions in the comments that I play an awful lot of games.  I definitely think I have some kind of gamer's ADHD.  It is certainly true that I try to have at least played some of almost every major game (with a few exceptions -- I generally just don't have the time & energy for all the sports games out there).  This has given me a pretty vast array of information about game mechanics, game content, mission, etc. which actually serves me pretty well as a game developer.  There is always a lot to learn from playing other games, even if they are less than stellar but I'll certainly admit that's not my primary motivation.  I'd finish a lot fewer games if my goal was just to maintain a kind of census of the games out there.

Actually I finish a lot fewer games these days than I used to.  Especially really lengthy games, like RPGs, which also suffer from the fact that I most enjoy the early part of most RPGs, when the mechanics are fresh.  A short, but high quality game is really at the top of the list for me, though I still like to go really deep on games when I can (witness my ongoing obsession with GTA San Andreas).  So I'll happily finish Dead Rising or Saints Row, but Oblivion, as good as it is, continues to languish with me somewhere halfway through the tremendous amount of content in that game.  I keep telling myself I'll go back to finish the Achievements in games like Dead Rising or Saints Row to really, fully, complete them, but I'm not really sure how true that is...

It is painfully clear to me that the rate at which games I really want to play are coming out is exceeding the rate at which I can possibly play them.  I'm still largely in denial over this mathematical reality...