I don't reply often on topics. However, this one cries for it.
Wasn't the player base shouting for a 10th class for ages? Okay, most wanted DK or Pandas, but that aside.
Isn't DH still losing at least 40% of it's matches? Plenty of decks and classes that work against it, while still viable against other classes. OP should do his homework and find out what works for him instead of begging for attention here. Sure, I hate it too when I have a losing streak. I just set the game aside for 5 minutes to reset the inner frustration and continue. No need to disqualify an entire class, just because YOU can't seem to win from it.
Fact: the meta shifts regularly. Tough that you feel that the current meta isn't your cup of tea. Cry for three more months until the next xpac hits. DH wasnt dominant before Darkmoon hit. Deal with it.