I think some people are underestimating the nerf that Crimson Sigil Runner got. It might even be cut from the deck entirely. It's either going to hurt the cycle in dh or it will hurt its early game. And these are 2 very important things in dh. It will still be really powerful, no doubt. But opening with a 1 attack sigil runner won't feel nearly as great as 2 attack.
Even though paladin only had 1 card buffed. I think the buff is more significant than shaman's 3 buffs together. Aldor Attendant is a key card in the libram package. And i've had numerous times where i didn't find the time to weave it in for 2 mana. Making it kind of clunky. The deck just runs so many 2-cost cards.. And no 1-drops, unless you put in 1-mana cards just for the stats (which doesn't help your main gameplan, just contest the board a bit). Adding in those 1-drops means you have to cut other, better cards. With Aldor Attendant at 1 mana, it will be way more consistent and a lot more pro-active to play this card. I hope it will be enough!
Shaman still lacks a win condition. I will try quest shaman with The Lurker Below because now this will just be a really solid card with a lot of potential. Against wide boards it's a really good swing card. But i still feel shaman will be at the bottom of classes.
Rogue will probably barely notice the difference, maybe switch package a bit. But galakrond and endless lackeys will still be a pain in the ass to deal with.
Warrior nerfs seem ok. Not too heavily nerfed.
But with multiple decks going down in powerlevel and others going up, the meta will definately change. If only one new deck is able to arise with these changes, it would already cause a shift in the entire meta, making room for even more things. I'm very optimistic as you can probably tell by the long post ;-)