My main critique of the genre is how lazy it’s done. There’s nothing wrong with having the MC reincarnated, transported, or made overpowered. One Punch Man has a massively overpowered MC but it’s still really good. The problem is that they’re all low effort cookie cutter stories that are just checking items off a list.
They’re also fairly unrealistic. “Gasp…is this that isekai thing I’ve been reading about? I guess I’ll go join the Adventurer Guild and get a super dangerous job killing monsters despite the fact that I’ve never been in a dangerous situation before.”
There’s no way all these random people will just calmly accept finding themselves in another world with no freaking out or depression setting in first.
This and the Nike ad have been the worst ads during the Olympics.