Battlegrounds
Alllll Aboarrdddd! You're now the conductor of the Melee Train Express. You will guide the melee train around the battleground while your team captures objectives. Be sure to throw one or two dots out in between stuns, silence yourself, I mean Disperse before death, and utilize your 200 yard area of effect taunt to aggro all the melee you see and stick them to you. Don't bother fearing, every class in the game can break it now, and will more often than not just earn yourself a 3 second Intercept stun. So, battleground hero, keep on eating those Bladestorms like a pro and pretend you're having fun.
Arena
Let me start by saying you're going to become very fond of the arena floor.(Personally, my shadow priest enjoys the floor the most when lying facedown with a helicopter warrior on my back.) So much so, that the texture might actually rub off on your character's face. If you get to freecast during a game, and you don't setup the world's greatest switch/silence combo, then you probably need assistance blinking and breathing. Free cast, free win.
Duels
Enjoy being a god while you can. Dueling is by far the strongest role of a shadow priest right now. I actually maintain a winning record against Arthas in our duels outside Orgimmar.
So, you brave few, you sinister shadow priests, wield the powers of Vampirism and darkness to dominate the World (of Warcraft), but don't wield them too well; I could really live without a few nerfs right now.
Original Article
Edit: Oh and by the way, can anyone see my email on the side or is it just me? I don't want random people seeing my personal email.