The shaman quest is pretty fair in comparison to mage, warlock, and DH. Shaman doesn't have the amount of card draw as the others and they can't discount there cards other than elementals. But if your playing enough elementals for that card your not playing the questline.
I feel like a decent solution to alot of the current metas problem can be fixed with simply card nerfs and card rotation.
If I were to nerf mage it would be by making incanters flow 3 mana or removing arcane intellect from standard. Mage has more than enough draw in comparison to the others classes and its a little unfair that they get arcane intellect while warrior can't have shield block or shaman cant have ancestral teachings.
If I were to nerf warlock I would make stealer of souls ability be a battle cry and I would actually increase the amount of damage necessary for questline completion. Warlock has more healing than a majority of classes so Thats kinda fair.
And my last nerfs would be just to rotate gagtetzan auctioneer from standard. Auctioneer has been around for a long time and removing it would allow newer cards to see play. Like the brand new minion in mage that draws a card after a fire spell is played. Auctioneer does the exact same thing but better and alot of solitaire deck tend to have auctioneer in it.