I don't think it's as bad as other stories of a hero being transported to another world, but our main protagonist for reasons unknown is un-killable. I don't have an issue per se with that, it's just that it's done cheaply in a way that you never feel any fear of loss.
FYI they also use 3d animations at times, which for me was a little jarring. Nothing special to write home about but not too terrible either.