Tried the Butcher's Circus DLC for Darkest Dungeon, so here are my impressions. It is interesting and infuriating at the same time.
Character skills are reworked for the Circus to fit the different gamestyle, along with Circus specific trinkets. It's interesting to build your team and deal with what your opponent throws at you. There are roughly three major ways of defeaing your enemies. One is to hit individual enemies with massive damage (like in the core game) and then deal one deathblow after another, this tactic usually revolves around marked for death skill. The second is to pile bleed and blight across the enemy team so they have multiple characters on the death door, overwhelming their healers. The third is to drive the opponent stress meter to the limit and can be combined with second.
The Death's Door mecahanics can be absolutely infuriating though, you can have enemy marked for death and survive multiple kill strikes from Bounty Hunter and Arbalest, while your characters fall to normal kill strikes on the first try. So the RNG plays even greater role than in the campaign. Opponent finder is fairly good at finding you opponents of your, or near your level, I only got one major mismatch. Connections crashes still happen though.
I also started a new story campaign, killed Collector on the first trip to the Ruins, without taking damage and Reynauld got accidentally cured of his kleptomania on the way to the Necromancer's apprentiece.