I think the Untamed cards are fitting nicely into game play so far. I only have a Gold level collection though so I don't know how things are shaking out when they get the max level stats / abilities.

It also takes nearly 2x the amount of cards to get Common / Rare / Epic Untamed cards leveled up to Gold league compared to the Beta / Reward / Orb cards which probably has a lot to do with price differences.