Yes. I nearly quit being healer, myself. During Garuda, a bard was standing next to a rock the entire time. Kept moving out of my line of sight, so I would have to chase them down, cure 2, cure 2 the tank twice, cure 2 the dragoon. Regen everyone. Then the bard would move again after taking more damage.

And I was blamed. "Newb whm. How did you get to this level? You suck. Everyone went without cures for 8 whole seconds. Learn to play. F*****g newb."

Did it the next day after a FC mate told me to not give up. We wiped a few times, most of which was cause someone went out of my line of sight. But eventually we got it.