Alright I'm just gonna say it:
The boss mechanics in the DLC are often lazy, uninspired, and bordering on just being plain bad. The humanoid bosses have all been sweet, but stuff like the lion/putrid knight/hippo etc? Fucking awful.
It's all the worst aspects of problem bosses in souls just amped up to 11 - awful camera problems (forget using lockon entirely), massive arenas that bosses just fly around at lightspeed leading to 30 second sprints just to hope to be in range for a swing, seemingly infinite attack chains/combos that have actual 0 downtime in between them. It's like they watched a meme video from the base game about oneshotting bosses with comet azure and just decided no one would ever get to stand still and swing a weapon or cast a spell ever again.