First off, I will start out by saying that Eden is one of our data centers better PvP healers. I have played several games with, and against Eden, and I can tell you that Eden is tough to deal with.
Now with that said, I do feel that there is a bit of exaggerstion. Most of the time, when a healer is playing well, kites, LOS, etc, it is difficult to nuke in a GCD. There are times when even great healers just melt away, but I wouldn't say it is a given. The stars need to be aligned, so to say.
On the topic: I recently have started playing PLD, and I do just as much damage as MRD, and also have quite a bit more utility. It really all depends on the player, more so than the class.