I think it's cool? Death Knights and DK cards seem kinda useless so far. I went nuts and crafted Arfus, and then immediately realized I should have saved the dust til the meta shakes out a bit. I've played games that last 25+ turns each, and also still slammed out a few easy games using Gadgetzan pirate warrior. I hope the game slows down, cuz I've always liked the newspaper-chess-puzzle aspect of the game more than just slamming damage into face.
Also the single player shit was weird. I managed to get through the first, third and fourth bosses no problem, but the OTK one was a bitch that took me like four tries