I'm actually a little annoyed, as on the Beta I did the Demon Hunter's, and now every Hall I've seen since feels inefficient in its layout.
On the other hand, I love how that fits the demon hunters as being pragmatic. All the Artifact empowerment is on one level, all the Mission stuff is on one level. Meanwhile my DK has to run to a teleporter every time he wants to pick up one of his troop types then back to the Mission table.