i just thought about how a lot of Illidan's problems comes from his poor social skills, which made me wonder if he's all there in the head even for a fantasy universe. He's almost always got the right intentions in mind, but the way he goes about things and his inability to properly explain his actions, tendency to avoid people, or just being an asshole to look tough (alternatively "cool" to feed his ego) is pretty concerning.
The whole Illidan novel makes him seem really ridiculous in how a lot of the problems in BC were because people got fed up with his bizarre, vague personality.