I like how you compare it to WoW's class balancing. And even go into detail how much they care and how much effort they go into testing and talking with top guilds, etc. Because...

Disc priest, still the penultimate requirement for every raid, and a well played one makes some others obsolete(mistweaver).

How about that sweet frost DK buff then immediate nerf within 3 days after patch released? All that testing sure was useful.

Blood DK still one of the strongest tanks and capable of soloing even current content (looking at you solo lord kazzak kill)

Should I go on?