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Asta
I don't know what to tell you man. Personally, this is like one of my most favorite mangas I am following. I picked it up because of Mangadex's high score and very find myself in agreement with the score.
At the same time, I recognize your logic. Completely share the view that a good writing shines through no matter the premise. I also share your view that there's a (up to a certain extent) exists a "universiality" to something be quality that it is quality - rather than everything being someone's "subjective taste".
But I do view this series as doing a great job in execution. At the same time, I can recognize the examples of things that usually detract from a work. I can't say Katarina is an exemplar of character development. Nor really does any nuances in changes in personalities of the characters. Basically the makers brought up of being good fiction.
But yet, I still like it. Not just like it, but one of my favorites. I think the key differences is our differences in "buy in" of the characters with a critical element facilitated by comedy and characterization. But it sounds like you were not amused by Katarina's enthusiasm and antics. For me, her crazy actions like the axe scene, the tree climbing contest, being called out of her eating plan, the logical yet still dense analysis of the situations are enough to buy in the story and the character. And with that, to buy in the surrounding characters. But it sounds like you didn't. I think that's what makes the difference.
I wonder if this means you'll more of a fan of another series - Honzuki no Gekokujou (Ascendance of a Bookworm). An isekai following a girl that is comical but going as a much slower pace between her and the characters round her.