Healers: Your heals are NOT more effective on WARs than they are on PLDs.
No really, they aren't. I know the number looks bigger, but the actual effect is basically the same, and actually your heals are slightly less effective on a Warrior.
Take 2 tanks, one of each. PLD in Shield Oath has 5,000hp and the War with Defiance has 6,250 (same health but with Defiance buffing it). Each tank gets hit for 1,000 damage.
The Paladin will reduce the 1,000 damage to 800, will have 4,200hp left and will require 800 worth of healing to top him up to full.
The Warrior will take the full 1,000 damage, and will have 5,250 health left. But Defiance also buffs healing received by 20%. 800pts of healing on a WAR would be boosted by 20% to 960, 40 short of being enough to top him off.
Your heals are ever so slightly LESS effective on a WAR than they are on a PLD. Yes, the number is bigger, but the effect is slightly smaller. Warriors have a certain amount of self healing available to make up for this deficit, so at the end of the day they're about the same in effectiveness.