The problem i had with this manga before i dropped it was the mc... i mean he has no character arc he doesn't go through ups and downs he feels stagnant and underdeveloped. i came here because i liked rouge like main characters but honestly, this one disappointed. i would say the art isn't bad and a lot of the side characters are actually pretty good and all of the story outside of the main character would actually be very interesting if the main character actually had a personality and wasn't so. fucking. dense. i mean a lot of main characters are dense in other isekais but not as mush as this black hole of a character ( yeah i know that was lame.) honestly this type of character is something that i really like and something other manga like "World Teacher" and "My Status as an Assassin Obviously Exceeds the Hero's" execute better. in the case of "My Status as an Assassin Obviously Exceeds the Hero's" the protagonist is someone who blended into the background like this one however he holds more of a personality and i wouldn't feel like i was talking to a brick wall if i really talked to him. of course this is all my own opinion and if you like his kind of character be my guest, but honestly i really only read this for the side characters and the world not the mc.
edit: by the way i do realize that the story is supposed to be a big joke but i mean, the mc could still use a personality