I'm just curious as to what other people think. Disregarding the whole: "a skilled player can win with any house" thing. Also I don't think all six houses are perfectly balanced. Personally (at least in my playgroup) I'd say Lannister with Baratheon as a close second. Feel free to mention which you think is the worst as well.

Rather than a house I would say any deck that put powers on house card rather than on chars. If I have to name a house i would say Gj.