I think you take this "personal preference" thing too far. I refuse to believe that anyone genuinely think THIS art and story line are 10/10 worthy, even IF they enjoyed it. I understand that things are subjective, but you don't seem to understand that even in subjective topics, there is still some general objectivity. That is to say, anyone who thinks a stick figure is a better piece of art than the cover art of one punch man is an idiot. Technically that's just a subjective opinion right?
I mean, TECHNICALLY, someone could feasibly think that literal dog shit tastes better than a pizza....you see where I'm going? The story is, objectively, trash. The art is subpar at best, no matter how you look at it. Trust me, I consume my fair share of trash, considering I basically consume trashy CN novels on a daily, manga is similar to me....and yet even I think this is some next level garbage....it's kinda telling.
Also the rating spread is kinda sus....Like you seriously think that more people think this is a 10/10 than mediocre? Are you insane? This thing has a higher rating than trashy generic isekai tha are BETTER than this in every conceivable way, whether it be art, romance or story.