What do I need to write at start it's NOT easy, really.
You need EXTREME good gear to compete with other medium geared players.
Enh Shaman are extremly gear depended as in PvP as in PvE.
Some ppl could laught and say that Enh Shaman is only about Poping Wolfs Bloodlust and Spaming Purge...
unfortunatly it's not even, if some ppl cant see it.
I will discuss here about 3v3 setup.
Cause for true 2v2 is dead already, and 5v5 is all about zerging one target. So you no need skill for it ;>
But 3v3 is another story :>
There arent much Viable setups for Enh Shammy so I will write the one I'm used to play :>
Beast Cleave + Holy Pala/Druid
(beast cleave is BM hunter with Enh Shaman) ,
That setup has amazing Burst Dmg, but not that good CC, that's why you need Pala or Druid Which can survive some burst dmg from oposite team :> Cause you dont hvae a lot of abilites to survive your healer.
Be prepared that you will be focues for whole of fight, especially when wolfs will be gone ;>
Be sure to keep telling your Pala to Dispell roots/frezez/stuns from you, cause in other way you are not gonna to do any dps :)
Remeber that you are playing with Hunter, you cant run around some phillar cuase then Hunter will not do ANY dmg.
Try to trap someone in the middle of the arena (by frostshock or hammer)
and the nuke him/her down asap :).
Remeber to try to zerg someone at start:) I mean wofls+ BL + hunters Bestial Wrath = amazing dmg
Remeber to use your Pala Stun, it's EXTREMLY immportant, if someone is targeting you. you are dead; > Most of dmg in woltk cant be outheal.. just cannot.. that's why you need to do eveything to somehow stop that dmg incoming :>
Preventing is better then healing remeber;>
some macros which could be usefull for you :)
/cast [target=focus] wind shear
/cast [target=focus] hex
If you will use them properly (putting Focus which you are not currently pummleing down and interupting all his Heals/CC's is really imporant.
Obviously remember about TOTEMS! You need to juggle them like clown in the circus :)
Grounding, Tremor. Earthbing, Stoneclaw, - those are your best frriends: >
Properly using them is a key to get out of fear, or ground some hex, sometimes you can ground even Deep freeze if you are good :>
Remeber that Wind Shear does not trigger Global CD, you can use it everytime you wish , (eveyr 6 sec:P)
That interupt with lowest CD in game.. but it silence target only for 2 sec.. so it's not THAT good as Rogue Kick but it has 35yards range :>
I hope I've help at least a bit :) if you have some questions fell free to write them down :>