Just want to chime in with no spoilers and express this was great. It proves that Illidan is a good person at heart, our attack on him in BC (while probably not thought out lore-wise at the time) was completely fucking stupid and nonsensical in retrospect, and most people that wrong Illidan in his life like Malfurion and Akama are bastards. In particular, I always assumed that the thing with Illidan being imprisoned for 10,000 years was pretty comical and overblown but it's shown just HOW MUCH it affected him. While it's too soon to probably post, I just want to know what others thought of it.
The "did nothing wrong" meme and saying probably doesn't apply more literally to anyone fictional more than Illidan by now.