Problem wih dh is hero power and warglaives of azzinoth. I hope they get addressed in future too.
The problem isn't the hero power, IMHO. It's the fact that they have all the things: card draw, lifesteal, silence, tempo cards, charge (that ignores taunt, really. The only class in the game that has that?!?)...and more. Seriously, what doesn't the class have? I know that many of the cards have conditions, but those conditions, as evidenced by win rates, are easy to meet. It's particularly bad with Odd DH in Wild. Yes, I'm salty. Not, I'm not just whining (to those who would as I am). The class is broken. I am glad they are tweaking as the season(s) go on.