Her character is blatantly inconsistent. Note that I'm not saying her reaction to events is wrong - because I don't believe that - but her character took such a hard turn from a logic-founded bookworm to an emotional rollercoaster that can't let go of her past and accept the Horde and Alliance for what they are, when even a character like Varian and Tyrande can, two characters who in the past were known for despising the Horde.
The whole Dalaran thing just kinda nailed the coffin in my eyes because of the symbolism in her abandonment of the Kirin Tor, whether intentional by Blizzard or not.
The last time demons invaded Azeroth, she was the only human who was willing to accept that the past wrongdoings of a people do not make them innately bad, or at least understand that you have to make allies of convenience to defeat an enemy powerful enough to destroy planets without a second thought. Now, she is virtually the only person who doesn't seem to understand this.
Sure you could say it's character development, but watching a likable and rational character go from being purely logical to an emotional rollercoaster wreck with seemingly no direction isn't convincing storytelling.
I mean christ, considering how much she's jumped between her opinion on the Horde, even after this I have no idea if next thing we know she'll be hanging out in Orgrimmar as the new Warchief. Who the hell knows anymore? She goes from hating the Horde to accepting the Horde to wiping the Horde from Dalaran to reluctantly accepting a truce with Lor'themar to threatening him the next time she sees him to then coming to an inner peace within the novel to then trying to forbid the Horde from entering a Kirin Tor outpost in a warzone to then accepting and even helping the Horde player empower their ring with her own magic to now despising the Horde so much that she would abandon all responsibilities if that meant she didn't have to work with them.
I honestly tried to defend this character for a while, because some bit of emotional turmoil and permanent distrust should be evident when a faction's leader is responsible for wiping out your city, but jesus christ, enough already Blizzard. Just send her in one direction and give her one story and be done with it. Stop bouncing between the two every time each faction bickers about something, it's seriously annoying how badly they write her.