I recently started leveling my shadow priest again and I just must say... Their damage is insane. My Nelf Spriest is currently level 64, and I just killed about 8 mobs in Nagrand at the same time using only SWP. I then had a full heirloom level 66 prot warrior descend out of the sky while I was finishing off these mobs. I had 3 shadow orbs, so I feared him, and proceeded to 2 shot him with Mind Blast and DP.
I swear I'm in love. No class should be this hilariously fun. I heard that Spriest suck at 90, but I don't even care anymore.
I think I found my new main.