Prot countered the Meta all last season. That is why many play them including myself. Stunandbung is 3.3k as Prot. Last season caused many Prot Pals to be born to fight those dirty casters. I enjoy Prot for all aspects of PvP.
There are a couple Prot PvP threads on the forums.
Old thread many nerfs and buffs since then but you can get an idea from the discussion on Covenant
Prot PvP guide for last season
Probably can just chime in on both threads with specific questions after you read them but they should give you enough info to get some ideas.