15. The Elder Scrolls 3: Marrowind
This is when Bethesda finally arrived my friends. One of the few games to actually have 'a world' I was blown away by what was created... A ridiculously deep RPG that shows World of Warcraft how it ought be done. I've spend countless hours with this masterpiece and you know what? I'm not ashamed. On the contrary, I'm proud! I've explored just about every nook and cranny of this world, know the lore backwards and forwards, and even did a little moon sugar here or there.