Morally Gray
The world is not black and white. Well, it can be but it is not often overtly so. Paper thin moral dilemmas were always a poor trope of video game storytelling.
In Knights of the Old Republic, most decisions were the choice of helping and old lady across the street or pushing her in front of the oncoming bus. There was very little real character development because all of the choices were so simplistic. Even Mass Effect's choices were very simple.
My favorite RPG of recent memory is The Witcher. Almost every choice in that game is picking between two shades of gray. The two main factions in The Witcher are some second class citizens oppressed to the point of becoming terrorists and a knightly order that is often racist but helps keep the peace and protect the citizens.
You can choose to support either side in the game or often just stay neutral. Neither side is the "good" choice but staying neutral can also have some consequences. There are many decisions like this in the game and The Witcher is the only time I have actually had to walk away from the game for a while to contemplate my decisions.
I know Bioware is always heralded as great RPG story tellers but in the past their story telling has resorted to the paper thin moral dilemmas. This all comes to mind since tonight I will get to start playing Dragon Age: Origins. Hopefully Bioware took storytelling further in this game since I know there are multi-hour long origin stories for each character (unlike Mass Effect which only has a slight change to the intro dialog depending on origin).