I just finished the quest mode for all characters. It was pretty fun, but the decks are very weak and it can be pretty frustrating. It feels like it comes down to luck more often because there's not a ton of strategic lines of play open to you. I did enjoy it, but I wouldn't recommend it super highly. There's a little more depth trying to fulfill the various challenges/quests, but I haven't made a ton of effort to achieve those. I'd really rather just play EDH with friends or work on a deck than play with such woefully underpowered decks.