^ This.
I completely agree with his aspect of PvP. Not only are you litigating damage that would go to your healer/team mates with your Guard/AOE Taunt/ Taunt, but you are one hell of a target to take down. I've had no problems going up againts other players who depend on burst damage because they quite frankly can't produce enough burst to even tickle me. If they attack my pocket healer I use all my taunts, and make sure he's shielded then just widdle him down while hes either concetrated on hitting me, the brick wall, or my healer whos taking almost no damage at all.
I've had crushing blow hits that devastate the lower armour classes, and quick foloow ups with force scream, smash, and vicious throw that finish em off. If you're looking for straight damage with minimal survivability then go Rage, or Vengeance. If you want to walk around like the unstoppable force you could be then go immortal. Then again there's always a hybrid spec if you can make it viable.
http://www.torhead.com/skill-calc#101frhcubrkzRZhGM.1
I use this for PvE, but find it highly useful in PvP as well with the correct gear, and team players.