I've played quite a few dungeon runs tonight and I think it's a really amazing single player expansion mode. You don't need any cards in your collection and can select the ones you want to add to your deck as you make your way through the dungeon. I got to the second to last boss but lost because they held over 20 damage in 4 spells and just demolished me in one turn. Dungeon Run mode is really fun and does capture the rogue like spirit as you can randomly find awesome cards and that can swing many boss fights in your favor. The new single player Dungeon Run mode is really fun but downside is you can't complete daily quests playing it. That's a huge bummer because the only way to grind for gold to open card packs is to complete quests BUT if you are looking to come back to Hearthstone and don't know the game well or have many cards Dungeon Run mode is the one to try.