I don't know if it was just not well explained or if something was lost in translation, but some of the fundamental logic is hard to follow at first. I think it might be otherwise consistent but it doesn't seem to be the sort of thing the audience is intended to not understand. In summary there is a major focus on the fact that players stop getting loot and experience from enemies too low level from them, which prevents strong players from being able to take the safe and easy farming route to make money (which honestly is probably assumed or just downplayed in any other series). The MC being stuck at level 1 due to his ability contributes to misunderstandings from other players, though in practice it doesn't matter much because either way he's too much of an anomaly for them to ignore. So it more or less ends up in line with every other "MC is stuck at level 1 but is actually stronger than everyone else" story.
This one is somewhat interesting for changing the dynamic somewhat so it's a bit layered. Rather than having earth be under attack by one single force or being the focal point of some multiworld resistance it looks like we're seeing a variation where multiple worlds are experiencing the same thing (the dungeon system) and competing individually, with limited contact to one another via individuals who have the same specific abilities as the MC. He's unique for Earth but has a counterpart on each participating world. While he may be well on the way to dominating everyone on Earth, it's up in the air how his other rivals will challenge him.
I think how they expand the scope of the story is going to determine whether this series ends up being bland or more interesting. They have the opportunity to set themselves apart with a few more innovations, but it's going to boil down to how they break away from the 'taking care of relatives' trope and how the interactions with other worlds or the dungeon system itself develops.