Aggro Shaman got better, I can't fault anyone wanting to win for playing it. I haven't dicked around with C'Thun yet, but I think we're all still trying to figure out what an appropriate sized C'Thun is. Everyone seems intent on making a really huge one but I'm not sure that's the right answer. I'll play Yogg-Saron at the start of the season when I just want to dick around, but too many times I've witness it kill itself, the player, or give the opponent a much better board state. N'Zoth though in deathrattle rogue with double Shadowcaster is AMAZING.
@bisonhero: It feels like a crappier Blood Knight. Now if it "ate" the secrets and gained taunt, I'd be interested - or did damage to enemy minions based on the number of secrets consumed, it'd have my attention.
So I'm struggling to wrap my head around the excitement of Eater of Secrets. It's a tech card that's really only going to value against one archetype of one class - which may not be viable anymore with Avenge getting rotated out. Even if it eats a full Christmas tree - it's a juicy Keeper/Aldor/BGH target and still has to deal with a full board of minions includes a 6/6 Challenger.