Completed with Shaman, Hunter, Mage and Warlock on the first attempt. Mage was the easiest. Warlock was the toughest final boss since I had to kill The Darkness with fatigue, while I also went to fatigue myself as well.
Druid 2 tries, lost both times to Trogg. First as boss 7, then as boss 6. Any advice on how to deal with Trogg using Druid would be welcome.
Rogue 2 tries, lost one to poor loot piles (went for the play a minion 5 times quest, did not get enough duplicate minions to pull it off) and once to the trapped room as boss 7 since I had no idea what was going on. I guess the trick is not to do anything on turns 1-7, just getting prepared for the eventual swarm of 3/3s.
Warrior, Paladin, Priest 0 attempts so far.