Here's an interesting bit of devil's advocacy for you. It seems that the best way to get what you want for your class is to hold a riot. Observe:
First, nerfs are announced to the priest class that hit Vampiric Embrace and Prayer of Mending hard.
Then, priests riot across the servers, as Blizzard promises to ban those involved.
But a few days later, priests profit, and un-nerfs appear in the patch.
The Inciter (Time for fun!) inside me says the evidence is clear: riots are how you get your way. Of course I'm sure that's not the message Blizzard wanted to send (has anyone heard of any major bans that went down because of the priest ingame and forum riots?), but, as Relmstein hints, the evidence kind of speaks for itself.
I should point out that priests didn't completely get what they want-- Vampiric Embrace, a staple of facemelting, is still getting a fairly harsh nerf, and PoM is still feeling that cooldown. But it's not nearly as bad, and while I'm sure Blizzard will claim the changes came down as a result of playtesting, it makes you wonder. I don't condone rioting or any kind of griefing, but as I said, this is devil's advocacy. Maybe the only conclusion Blizzard should take from this is simply to not release the patch notes (as they would say) until they're done.