shamans didn't get nerfed, they just got shitty worthless new skills that are either highly situational (water shield, only good for solo grinding and MAYBE 5 mans) or have cooldowns that make them near useless (everything else new that they get).
Oh, and their talents are still vastly inferior to warrior talents for anything but the resto tree.
All warriors need is for blizzard to get rid of tactical mastery as a talent and make it an inherent skill. Shamans, meanwhile, still need 2/3 of a talent review to make enhancement and elemental specs worth going for at 70. Especially elemental, since that tree's the worst talent tree in the game. I imagine the first content patch after the game goes live will capitulate to the warriors and maybe nerf rogues/hunters a little bit, then eventually they'll actually make shaman talents worthwhile for anything but 0/40/21 (which is honestly "buff the rogues and warriors" spec) or 0/20/41, which is still "lolz drop totems and heal."
And if anything, priests are really good at 70. 51 talent points don't really allow for a good build, plus their new spells are awesome and make them a lot stronger than they are right now at 60. At least, that's what priests who hit 70 were saying in the expansion - they felt borderline overpowered. Not pre-2.0.3 affliction warlock overpowered, but still overpowered. There's no doubt that the discipline tree sucks compared to shadow or even holy, but a heavy shadow priest with a little bit of discipline or holy isn't bad. At least blizzard really made shadow priests a lot more viable in the expansion beyond just grinding.