Seriously, it's incredibly entertaining to play and rewarding to complete.
My time was 36 minutes and I don't regret a single one of those spent. Husks were plentiful and challenging, but the random loot and generally balanced level gave a feeling of power whenever I'd dominate a crowd.
Minibosses actually seemed like minibosses, and I was scared to engage them.
Revive statues made failure seem less painful, so I was less anxious while playing.
Dungeon crawl style layouts and traps makes for a less build intensive, but still encouraged, play.
Final boss was actually stressful, but not impossible (thank you scrap shot with incredibly fast draw speed).
Who designed this mode, I want to give them all my thanks. It should be permanent IMO, it's that well done.