Review Detail of Spelloyal in MHA: reincarnated as a devil’s servant

The writing quality is average, without major problems, I consider it ok for a fanfic. The stability of updates is really very good, chapters every day without fail. The development of the story is unfortunately very bad, an MC with a system that encourages him to commit crimes / sins, some 18+ content coming from nowhere, a standard past but a little bit done. The character design is weak, none seem really alive, they all look like secondary npcs from any game. Even the MC has nothing special besides his system. It would have been better to just have a 100% evil mc as in some gamers fics, instead it seems that the author is doing everything, even making the whole world evil to give a reason for the mc to become a villain even though he is someone good. The worst I've seen so far is how a hero (who is obviously actually a villain) manages to commit crimes without any problems, things like kidnapping an entire orphanage and selling children with the help of some cops is done like this is a novel of cultivation in a lawless medieval world, where only combat power rules, instead of a modern society where the disappearance of an entire orphanage would be extensively investigated. Something like that is impossible to go unnoticed in a modern world, maybe I believed in something like that in a world of high fantasy where the power goverva, but in boku no hero where 99% of the quirks are not as good as having a revolver, something like that is completely impossible. To be honest it is even more impossible than in the real world, as there are some quirks that can help track missing people. (Sorry for any mistake, my English is bad and that's why I used google translator).