ZoS.... That was so much fun. Unhallowed Grave is now my favourite dungeon. Absolutely love the mechanics. All the bosses are awesome and love the grappling. I've run it with four groups and we've all spent a good ten minutes each playing around with the grappling hooks. The hardmode didn't need any luck, it was down to pure awareness, ability and communication. And the huge skeleton is the best thing in the game. We all absolutely loved it. Everyone I've spoken to is a huge fan. My chat log was full of people loving it.
Icereach isn't as fun, but still good, nonetheless.