Priest is very good at PvP when you are shadow. You can shield yourself, fear the enemy and you stun a LOT.
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Explaination:
As a shadow priest, you can do a lot of damage on the target, you have shield and you stun a lot. Because of those 3 factors the target isn't able of doing much damage. Also, because of Vampiric Embrace, you heal yourself every time you deal damage. If you're low on health you can use Psychic Scream and heal yourself and run away.
And then there is another good point: If someone else carries the flag in WSG, you can heal the flag carrier and fear enemies away.
That's why a priest is good in PvP.
The Tactic:
If the enemy didn't spot you yet, you start out with Mind Blast, followed by Power Word: Pain. Then shield yourself and use Mind Flay until the target get's stunned. Then you use Mind Blast and Mind Flay again. Shield every time you can. If the target attacks you first, skip the first Mind Blast.
And if you've reached Grand Marshal, you can always respec disc/holy and go end-game PvE if you want. Priests are always needed
