Hearthpwn

They have to start somewhere. If someday, dragon paladin got enough synergy to become op, then people would compain "why would blizzard ever print such an op 2 drop." You cannot expect all the support of an archetype to appear in one expansion. Dragon priest took some time. Taunt warrior took some time (there was taunt synergy released, but the quest finally made them worth it, and only now, with more removal tools and better taunts, is the quest worth it). It's part of blizzard's design philosphy to create cards that enable different artchetypes and styles of play for each expansion. Only after enough support do some archetypes have the "critical mass" of cards to become worthwhile. They don't always turn out ladder viable, but that doesn't always matter. What matter is that the deck can be fun and different. This may be more difficult to justify to people like us on a forum, but for most players, they aren't looking to reach legend with a deck, they're just looking for different decks to make and play, and cards like this guide players towards making a thematic deck.

Edit: That being said, I'm not a fan of how blizzard created and abondoned the freeze shaman archetype soon after , especially having gotten moorabi as my first 10 guarenteed legendary of KFT. Gargoyle is a good card when it activates, whereas moorabi is not even good if the freeze archtype worked. Also, freeze as an archetype seems problematic to me. It works off negative tempo for the opponent, in a style that is rather uninteractive.