This seams to be a common thing in new expansions now a days ( get a new hero or unique ally that you cant use in a new scenario ) and i like to read your thoughts about this.
I thing that's part of the fact that the " lets make a cool new quest with nice new mechanisms " have changed to " we have to make a new quest to "attack" the current meta " and during this effort they have created some really hard but heavily luck based and frustrating scenarios, in my opinion.
Edited by iznax