Health of PVP

New to warmane, curious where the pvp scene is the healthiest. Is 2v2 truly just a warrior/paladin paradise based on the leader boards? Is 3v3 dead except for to the elite and casual with a dead 1800-2k rating? Is battleground the locale for a variety of classes? Has shadowmourne ruined wotlk pvp?

I'm curious if I need to be meta to enjoy arena, or if the other classes are viable. Any input on the health of pvp either on BlackRock or via ice crown would be appreciated.

BGs and arenas are crossrealm. Basically, all you'll see in arenas is arms/hpal no matter which realm you pick.

You can see occassionaly other picks like: Warrior+ret pala, dk + warrior and something strange, but that's once in a while. While I did arena on all characters > literally 90% of arenas were warrior+hpala... and all with almost wratful gear or full relentless, just amazing.