Sword of Spirit
Legend
Battlestar Gallactica is great inspiration for a morally ambiguous game. In D&D 3e terms, there are some evil character, perhaps 1-2 actually "good" characters, and a whole slew of neutral and lawful neutral (it is military) characters. But it's all very intense, lots of causes people are fighting for etc. I have no exposure to Game of Thrones, but I get the idea it's probably similar.