Customization, as many others have said. I like really feeling like my character is kind of changing over the course of a game. Its why I fukk with a lot of Bioware games so much. I know the good/evil thing is kinda played out and simple, but I recently replayed both KOTOR games and I love how the games made you feel as though you were definitely crafting your own personality and what not.
I enjoy creating my own players. I enjoy a good story, and TW3 is one of my favorite games ever, but I like being able to come at a game with a completely different play style, and a different personality. Real nerd shyt lol
one of the reasons why I REALLY fukked with Divinity Original Sin and am pumped that they're remastering it and releasing it to consoles. The way the game tells the story and lets you role play between your two main characters is so fukking dope to me. Never finished it, but I did play a good 30 hrs before I heard about the remaster. Just gonna wait for that for real. I love innovative shyt like that that really allows you to flesh your your character.