tried dungeon today run for the first time since launch because I had a 100g quest. I completed my rogue run which was left from launch. I completed it with azari as the final boss. Azari is the only final boss I know so far, so I know what to expect. With my deathrattle heavy deck, I could beat him with relative ease but I wasn't too sure at the start.
Then I tried warrior and I could complete the run on first try because of pirates ( 4 patches, 3 skycrap pirates). Final boss was King Togwaggle. He was dead by turn 9.
3 classes complete and I played the mode 2 times. Well, call me lucky.