Personally I have complicated feelings about this DLC.

The world design is a 10/10 for me but the rest...

For a start the Open World feels a bit unrewarding. I don't really have a problem with the abundance of empty space but the rewards you get for exploration feel a bit weak to me. I would have liked a few more weapons in chests and other places instead of Smithing Stone 8 #1241. Case in point: They added 8 new weapon categories but from what I can see barely one of these new categories has more than a single regular weapon in it. Definitely a missed opportunity.

As for the combat it's fine outside of the bosses. The enemies hit like a truck but once you figure out the gimmicks it's quite manageable. The bosses however are some of the worst in the entire game. I'm not an outstanding player, I'm not even good. But me being bad is not quite the problem I have with these. The problem I have with these bosses is that they are frustrating. For example the first Dancing Lion Boss has such an arsenal and length of combos that, when coupled with its flowing moveset, I cannot find a reliable gap to exploit. I think I found one only for the boss to switch up the Combo the 3rd time around (not HP related changes) and kill me anyway. Add to that the camera being absolute garbage and it feels like I'm fighting a duo boss. The cooldowns between their combos also are annoyingly uncertain, sometimes you have a gap to heal after a combo and sometimes they start the next combo almost immediately. Now mind you there might be gaps I don't see but if the only people who can even find the gaps are the top 20% of players then negative reviews will be inevitable.

What makes this entire thing worse is that as soon as you employ spirit summons the entire charade is exposed. The only reason these bosses are "hard" is because they hit you in a relentless torrent of combos. The moment there is any other target to take the heat off of you the difficulty plummets into the core of the planet. Oh and also their pathfinding is absolutely shot, I've had multiple cases where Bosses (and regular enemies) got stuck path finding towards me because I was standing on a little pebble or behind a pillar. I think mages are also completely fucked because almost every boss I've stumbled upon was in permanent distance closing mode. No or extremely rare walk phases where a mage could fire off a few spells but instead just constant pressure.

I think the Bosses can't even be easily rebalanced because the problem is not that they are too tanky or deal too much damage, they are imo just terribly designed to where they are too hard when in a 1v1 and too easy in a 2+v1 due to their move-/attacksets. If they rebalance anything maybe the frequency between combos could be tuned a bit but I really don't think that's going to change much about how people perceive these bosses.