The Faction Champions match is a PvP fight done in PvE gear. You’ll be up against members of the opposing faction. For this round, your ability to survive is more important than your DPS. It’s also a good idea to have your crowd control abilities within easy reach. Evasion, Cloak of Shadows, Kick, Blind, Gouge, Vanish, Dismantle, Cheat Shot and Kidney Shot are all going to be vital for the fight.
Since this is a PvP match, there are no phases or gimmicks. The key to winning is to know which target to prioritize. Obviously, healers are on top of the list. Your raid group should be able to identify which is which and mark them accordingly.
Stay away from the melee members of the enemy group. From what I’ve seen, they all have a habit of using some AoE ability such as Whirlwind that literally drops your health to half or more. On normal mode, they can be taunted, so your tanks should be able to keep them distracted.
Your targets can be stunned. It’s a PvP fight, so both Cheap Shot and Kidney Shot work. If you’re having a hard time bringing a healer down, stun him! Like I said, DPS is only a secondary concern for this match, so don’t feel bad about not using those precious combo points on a damage-oriented finisher like Envenom or Eviscerate. When you’ve stunned a target, call it out on Vent so your teammates know they can unleash more DPS if they want to.
Get ready to interrupt! Kick should be your primary interrupt ability, but keep in mind that Gouge, Kidney Shot and Blind work as well. If you have Throwing Specialization, Fan of Knives can interrupt, but it’s getting nerfed in 3.2.2 so don’t get used to it.
Regarding survivability, Dismantle works on anyone, but it’s better to save it for melee targets. If you’d like to get someone off your back, Gouge works well. Just make sure your target is facing you. You also have Blind to fall back on. If all else fails, Vanish.
Still on survivability, Cloak of Shadows and Evasion will keep you alive if you use it well. Don’t expect your teammates to be constantly on the money when it comes to dispelling debuffs on you. A well-timed CoS will remove them and grant you near immunity to spells for a few seconds. Got melee AoEing? Evade before you run away if they happen to be too close.
That’s it. Like I said, it’s a PvP fight so there’s a bit of unpredictability involved. Keep yourself alive, tweak your group’s strategy to match your opponents’ abilities and you should be able to push past them.