https://www.mangago.zone/read-manga/ares/ not-so-horrible honestly, it kinda grew on me after so many years. Still my favorite manwha ever :)
https://www.mangago.zone/read-manga/mob_psycho_100/ a classic
I tried to go for objectively bad art - inconstant anatomy and proportions that are not part of an artstyle but are instead drawing mistakes.
Honestly the first few chapters of Attack on Titan could fit your theme except that I found it so boring that I can call it a good story :/
Don't hate - on webtoon.
The plot is so original with a lot of things going on. I am not up-to-date (I've read around 100 chapters) but apparently the story stays pretty consistent until the end.
I'm usually super picky about art but sometimes I dig in if the story is good. I've recently read one and now I'm in the mood. Please suggest some before my mood fades ╥﹏╥