Solo Levelling is... fine.

It shares some odd similarities with One Punch Man, in that the art is by far the most outstanding quality in it's favour, and also that the main character is the least interesting one around.

I will freely admit that the story simply doesn't appeal to me on a personal level. While edgy loners seem to be all the rage, I don't see much appeal in an antisocial loner being the best at everything in a story, which would normally be defined by characters and their interactions, especially when the plot itself notes the MC as explicitly 'special' with his status as the Player.

The setting, while nothing original if you've picked up any modern Korean works, is decently well explored, the community of hunters and how they interact with dungeons, each other, and the world at large gets a fair amount of explanation.

The characters are bland at best. The dark, sullen lone wolf MC is the only one with significant screentime, and when he isn't really interesting enough to make me care about the story, seeing the other characters being used only to frame how cool and edgy
he is is borderline painful.

As someone who's deep into the light novel scene and has gone through a ton of Korean novels with similar premises, seeing others lavish praise onto this work feels like seeing people watcing Dragon Ball Z be aired for the first time, from the perspective of someone who has seen modern shounen. Works such Omniscient Reader's Viewpoint or The Novel's Extra do much more interesting things with the same blend of modern Korean sensibilities and extravagant fantasy elements.

Overall, a fine, but unremarkable power fantasy KR work with excellent art to distract you from the lacking character.