Well, it's not like the show has been mild in terms of brutality.
It has been bad at animating stuff, but the things that happen on screen are pretty dark.
Ains ripped out the beating heart of a human soldier and squashed it.
The Deathknight beheaded and cut multiple warriors in half, we even got to see it in first person from a soldiers point of view who was about to lose his head. - it's not like these moments were "funny" when they happened just because it looked silly.
The list goes on and is pretty long.
It wouldn't really harm the show to animate it properly, obviously the novel art style is unrealsticly detailed but there are better ways and better CGI that would fit in very well.
The scenes in that episode lacked any impact due to how the enemies looked, the Barghest would've made a much better enemy. Would've fit in quite nicely as well.
I'm really disappointed in *how* bad it was. The troll (and even worse the trolls behind him) was (were) some kind of CGI - shader - rough sketch mishmash... I don't even know how to describe it.
It was below the already very low effort CGI we've seen so far.