Okay

Im doing this to help people not be so intimidated by arenas, I want more compitition and hope to see the pvp aspect of this server grow.
Class roles in the arena!
Druid:
Druids are pretty leet healers as they can HoT their partner up and run out of danger. A lot of druids in retail and higher up rated teams are resto but since some talents are broken on this server its not as great but that doesnt mean resto is useless. In higher rated teams you dont see a lot of balance or feral druids, but that doesnt mean they are not there, and there is no reason you cant be. Feral druids though can be pretty useful.
Hunter:
Well your pretty much going to be ranged dps and draining healers mana. Since BM is broken I wouldnt really suggest going into an arena as BM, I could be wrong though, spec MM and some survival points and like I said stick to dps'ing from a far, make sure you drain healers mana and CC a healer if you must.
Mage:
As is with hunters you are ranged dps but you cannot drain mana, but you can CC people, really any spec is viable with a mage, I think arcane is broken so you want to stick to fire or frost or a mix of both, I my self play am age in retail and he is 17/0/44, its a cookie cutter spec with improved Counterspell (silence) and the rest into frost, I think frost is more handy as you will live longer with out heals.
Paladin:
Ah my class in WoWRage

The way I see it you are either a Retadin and you are going to play the warrior role and beating people down or your going to be holy (like me) and heal such classes, with as much armor as you might have you possibly would fair off better than a squishy healer, and paladins have what I like to call "OMG HES BACK AT FULL HEALTH AND HIS MANA DIDNT MOVE" manapool. I have honestly never seen a prot pally in an arena, I would know nothing of the sort to help you out, I am sorry, but by all means mess around with it, see if you like it.
Priest:
Priest are damn good healers, AND you can drain others mana with mana burn, if you are going into an arena as a holy/disc priest you will be mana burning and healing the majority of the fight. Shadow Priest however might not heal at all, as it cost a bit of mana to go in and out of shadow form, Shadow priest are going to be dps and draining mana from healers.
Rogue:
Rogues are going to be dps'ing people down and Sapping the other might be a good idea, depending on your play style and team strat just who you sap will change, really since mace stun isnt as good as it is in retail 0/30/31 isnt great, its still viable and it gives you a lot of cooldowns to use at your disposal (Unless prep is broken then nvm) the spec will depend on playstyle as well, with rogues but your pretty much going to be sapping someone and burning the other down.
Shaman:
Ah the shaman. I think resto shamans do exceptionally well as healers, and as of now they are also going to have what seems an infinite mana pool. and more armor than a squishy would, but not as much as a pally, but they also have a chance to deal more dmg need be than a healing pally would as well as earth shock. Ele shamans arent that bad dps either, though you will go OOM fast without clearcasting so if you dont have someone down by then your a sitting duck, enh shamans should also be a force to be reckoned with, kited easily though.
Warlock:
Warlocks are impressive DPS in the 2v2, devestation if you underestimate one. High rated teams with warlocks are ussually SL/SL which means siphon life and soul link, with soul link broken though this is much of a spec here. Whether you choose to be affi or destro you will be dotting both targets and maintaining your own health with drain life or draining the mana of a healer or mana'd dps enemy. Warlocks should look for a healer as they can do more dmg if they live longer and let the real dmg of their DoTs sink in.
Warrior:
Warriors are going to be the big guns in a team, as they can put out intense damage as either arms or fury. As arms you get mortal strike which lessens how much the victim can be healed for. And fury just has a sick load of damage output and crit. Prot warriors beware, threat means nothing in PvP, you will be hard to kill, but you will not be killing quickly, a prot warrior with a healer going against a team with no heals will probably outlast the other team, that is about all the good I can see in a prot warrior along with stuns.
Good ideas on a partner!
Druids~ Should look for a dps partner (if resto) [dps druids should look for a dps or healer]
-Some good teams with druids are Druid Warlock | Druid Rogue | and Druid Warrior
Hunter~ Should look for a healer or dps
-Some good teams with hunters are Hunter Mage | Hunter +*any healing class* | Or Hunter Warlock
Mage~ Should look for a dps or healer
-Some good teams with mages are Mage Mage | Mage Hunter | Mage Shaman | or Mage Rogue
Paladin- Should look for a dps
-Some good teams with pallies are Pally Warrior | Pally Rogue | and maybe Pally ele shaman
Priest- Should look for a dps
-Some good teams with priest are Priest Rogue | Priest Warrior | and Priest Warlock
Rogue- Should look for a healer or dps
-Some good teams with rogues are Rogue Priest | Rogue Mage | Rogue Pally
Shaman- Should look for the opposite of their spec (resto should look for dps and vice versa)
-Some good teams with shammies are Shaman Mage | Shaman +*dps class if resto* | or Shaman +*any healing class*
Warlock- Should look for a healer or a dps if they can CC
-Some good teams with locks are Warlock Druid | Warlock Hunter | Warlock Priest
Warrior- Should ideally look for a healer
-Some good teams with warriors are Warrior Pally | Warrior Priest | Warrior Shaman
Footnotes!
Off the top of my head some teams I know that melt faces
Warlock Druid- Ow omg /cry. This is a mana battery kinda of thing... warlock does his stuff, druid heals him so he can life tap and never run out of mana. Druids also should cyclone a healer if possible and root pesky targets on self
Priest Rogue- ... Rogue burns his cooldowns like a mad man and hopefully burns one target, good rogues will CC the other with Sap Blind or silence healers if they are near with kick to keep their focus from being healed. Priest heals rogue if needed and mana burns healer/mana dps
Warrior Paladin- (me and moose) Big guns right here, warrior chooses a target, preferably the more squishy of dps if not the healer, Pally heals warrior and self, both classes are in plate so melee dps against this is nullified greatly, pallies can last a long time with their own mana pool on flashes alone, and bubbles can make a quick mess up nothing but just a quick mess up
Mage Mage- Two frost mages, two skilled frost mages can essentially keep a healer or other sheeped/silenced and use the lovable kitting abilities of frost to down the other. Ice lance is the weapon of choice here.
Mage Rogue- Rogue can sap one both mage and rogue target other once sap is done mage polymorphs & still burn other down, rogue blinds after that and both M and R continue on the target, hopefully they have one down and its now 2v1
Mage Shaman- Mage will dps non healer (sheep the healer or other dps) shaman will heal mage (i woudlnt suggest aiding mage with dps as you will run oom) shamans can pop heroism, frost mages can pop IV and that is GG right there, mage now has almost 1.5 second frost bolts
Warlock Hunter- Essentially a draining strategy. Both classes can uber drain the mana of a healer or mana'd dps and make them ineffective. Warlock dots to make sure damage is constant, hunter can dps from a far.
Mage hunter- Both range dps, mage can CC one and both can focus on the other. Frost mages can get shatter combos off a hunters Ice Trap, this gives a mage more opportunity to deal more damage.
End.
I hope this helps some people get over the fear of arenas. If im wrong (which I probably am) feel free to add on to this or give input on bugs with classes that may affect strategies here. Now go to nagrand, make a team and get out there!
EDIT*
Okay, about arena RATINGS, since I saw a post about it, you get arena points based on the rating of the team (duh). You get more rating by winning arenas vs team (in retail you would play arenas vs teams that are about your team rating so its as fair as it can be) In wowrage I dont think this applies though. Also in retail the higher the difference in your team ratings affects the amount of rating you gain/lose. Say if you are facing higher rated team and win, you gain more rating if you face a team with a lower rating and win. All this updates instantly in retail, it updates this data when it updates honor.