The story is in the World of warcraft. Hearthstone is a game inside WoW universe.Now THIS I agree with. No Loken, no Thorim, only two SoO bosses (and Xaril was only one ninth of a boss encounter), and only one boss tied to N'Zoth (Cho'gall)...instead we got reverse Rag, reverse Deathwing, reverse Hogger, reverse Nat Pagle...none of which make any single, solitary bit of sense whatsoever.
Another thing that I give massive credit to the designers of Magic as opposed to Hearthstone. Magic's card design is based around the story of that particular block. Invasion block was when I first jumped into playing the game. The entire set told the story of the end of what had been an ongoing storyline for several years. The set after that told the story of the world after the fall of Yoggmoth. The newest blocks do the same. Telling the story of the various Planeswalkers (Jace, Chandra, Nissa, Lilliana, and Gideon), then the story of the Eldrazi invasion and how the Planeswalkers banded together to stop it. And now in Shadows Over Innistrad, we get a new storyline told through the set of the corruption of Avacyn.
And what do we get from Whispers of the Old Gods? No stories. Just "hey let's take some guys and make em good/bad instead and call that a quality expansion set!". Yeah...no.