Yesterday, Ghostcrawler got into a discussion with some Priests on the Healing forum. It's in a thread that started out pretty negative, but unfortunately reflected an opinion rippling its way through the Priest 'community.' Many (not all, not nearly) Priest players are getting sort of grumpy about their Healing role, and that's not actually a new sentiment. It's been sort of an everpresent issue since well before Wrath. Priests don't feel they have a role. They sort of exist, without any clear purpose.
The issue that came up is that a number of Priests think Blizzard is down on them, they're subpar, the devs don't care, blah blah blah. Ghostcrawler is of the opinion that Priests are actually pretty great (not said in those words) and I gotta be honest, I agree with him on that. On all things? No. On that? Yes. Priests are very, very capable Healers. But capability is not actually the issue at all! It's an issue much harder to pinpoint.
Priests, when you look at their spells as a whole product and don't get hung up on any one ability in particular, work great. It's a well rounded class, and operates very well on its own. Holy Priests are great healers, and there's really no situation where they're completely helpless. I am not sure what the phrase "healing dynamo" means exactly, but for some reason that pops into my head when I think of Holy Priests, so it's probably a good thing.