Hopefully it's addressed in the next patch, the cards being used aren't right. My party is level 19, been playing over and over again. I've see plenty of promos, B and C boons, but nothing above that. On the other hand I have fought deck 2 henchmen and deck 1 villains/hench.
When I go into the vault from within Quest mode I see only five boons from deck 1 (Frost Sling +1, Kohl of UD, Pot of Invisibility, Chameleon, Menagerie) two from deck 2 (Paralyze, Blackcloth Armor) and haven't encountered a single one of them. Nor have I encountered any non-chest cards from 1. Not much point playing quest rather than grinding Poison Pill legendary solo with Mersi (so it's faster and get the 200 gold a pop). The quest decks are a little under-powered compared to the opponents.
A little variety might be nice.