Out of them, I have only gotten to
Dancing Lion(bad/Frame rate on bite attacks)
Renalla(good/Balanced and visually appealing)
Messmer(Ok/second phase hard to track)
Romina(Bad to ok/ second phase too much time in the air, and hard to track up close
Putrescent Knight(Just started)
I must have missed that Gaius dude. The map design has me very confused in many places. Will eventually need to look up how to get certain places. Will say, subjectively, that this is not my favorite Souls dlc by far. Objectively, I can see why many would absolutely love it.