MGS is great. I second whatever everyone has said positively (I will read it later I promise!)

But yeah, Pete, if you can find Deus Ex: Human Revolution Director's Cut for cheap, listening to the commentary is great. I've never listened to commentary on anything before but it's great to hear how it all came together and what the thinking was behind it and how some things almost made it but didn't and some things weren't quite right even at shipping etc etc etc it's awesome fun.