There are a lot of artists that started their career with adult things, it’s not uncommon and it’s not a bad thing either but in the case of OPM the director said himself that he’s somewhat inexperienced, especially with action shows like OPM. Adult anime is also known for its very poor animation quality. Many people are angry because not only we got a studio that can’t produce anything of S1 level but also they didn’t even hire experienced people.