4. The People
I haven't played many RPG's before. I played Fallout 3 and the Mass Effect series, but that's about it. I found it rather amazing how the state of the AI changed. One minute they were a shop keeper, then a dragon comes and all of a sudden he stops running the store and now he's fighting. I've never seen random AI engage each other like that. Seeing a dragon fight a giant, then a random goat joins in is rather incredible and certainly exclusive to Bethesda's games.