The world and the characters are at odds with each other, and I don't mean the world is harsh and anti-human, I mean the characters don't act according to what the world is like. Imagine a world where there was no rain but everyone had an umbrella on them at all times. That kind of contradictory existence is every character in this manga.
Great at magic, but demands to be a swordsman and is willing to die at level 1 to avoid using magic. Thankfully the plot saves them.
Person born with wings, in a town with a legend about an angel with wings helping people and being a gift of a god, but the parents think they're a demon and refuse to name them.
The dungeon is super dangerous, apparently so dangerous that unprepared solo adventurers are better off attacked and left for dead instead of helped. Yet everyone outside the dungeon makes fun of low levels and refuses to help prepare anyone or level anyone up.
The plot forces a character to become confused (quite forced on more than one occasion), only to use it to charge up something and make him less capable of emotion.
The main character needs information and asks the less obvious, wrong questions instead of the obvious right ones that would help him.
It's honestly insane to have everyone contradict the world in which they live and somehow expect to have any kind of civilization, and yet this author writes such a civilization.
It's a crying shame, because the world seems so interesting and the plot should make something special out of it, especially with some of the unique things that are done like monster design and the bosses and how they function.
But no, we get a story that might as well be a world without rain with people that carry umbrellas. It's like all the good things get undermined by all the nonsensical consequences to the characters' actions.
Death by a thousand denials of reality.