I've been noting that healers are just a bit overtuned for some time now. Bear with me on this one:
MCH Shots with ammo: 1250, 1500, 1750 for a total of 4500
DRG Wheeling Thrust Combo (JUST the combo): 500, 1000, 1250, 1250 for a total of 4000
SAM Meikyo spam (to build to Midare): 1250, 1650*, 1650 for a total of 4550 (1650 is implying you applied Yukikaze's 10% damage up on the enemy first).
WHM (for example)
Cure I: 2500, Cure II: 5000, Regen: 1500 every 3 sec for 15 sec (5 ticks)
Cure I more than outheals any single hit in a combo, and Cure II easily outheals a full combo. This would be hell for any job without a notable burst like MCH. At best, I can proc a Heated Clean Shot, apply Wildfire then "burst" with Stun Gun (1000), BTE (2000), then the HCS (1750), with the WF exploding for 2000 (rounded up) for a total of 6750. . . One Cure II and a Regen applied would just wave that off with a combined 6500 heal. And that's raw. Apply a Protect and that 20% less. Apply a Benison and that's mostly just absorbed. Safeguard is another 25% less. THEN there's still the 1500 Assize heal and Benediction in a pinch.
And that's just in a one on one. I've seen WHMs survive a 4 on 1 assault from a decent mix of other jobs. . . TFW healers are better tanks than tanks are in PvP now :/