I'm extremely excited for Legion, but it also makes me extremely cautious with how initially excited I was for Warlords.
Warlords questing and story phase was great, but the end content felt too trimmed. The story seemed abruptly brought to a bottleneck and the endgame content felt stale quickly, almost a repeat of the SoO raid.
But, features like artifacts, PvP and for the matter of them even adding new animations to the game does keep me a bit more optimistic than nervous. So let's bring it on!