Doing all characters for their order halls. Shadow priest is my fifth, and I've just completed it. Conclusion; I never wanna touch this class again. It's a mess. It's too squishy and its damage is actually kinda pathetic while levelling (and at fresh 110). Being unable to solo more than 2 mobs most of the time isn't fun.
How did they make such a great spec thematically the worst to play maybe in the whole game? It's honestly an achievement. I wouldn't wish it on my worst enemy. Never playing priest again :P
Only made worse by the fact they repeatedly call you High Lord in the campaign, probably to remind you that you're inferior to Paladins :')