He is an excellent speaker, first of all. That is a huge thing, when you have to present nearly everything about WoW, so making it sound good is a huge plus.
Furthermore, i like the way he talks about stuff. Many devs, both in WoW and other places, like to talk alot about the very good stuff, boosting their own ego and so on, yet Ion have does not do this. He has many times talked about things i did not think he wanted to talk about. He is the WoW dev who have said "Sorry" the most times and when it was needed. While i sometimes feel like i want to punsh guys like Alex Afrasiabi in the face, i never have had that with Ion.
I also think the Q&As with him have helped alot. He brings good news to me and it makes it easy to like him.
On the other hand, he is the guy who keeps approving bad designs for WoW and who allows this shitty story-arc to keep going without any improvements....But i can look past that, since i think it would be near impossible to make everything alright when you have to oversee one of the biggest games out there.
So i like him. I think he is a good guy for the job and i think that most other candidates would do much worse.