It could have been a good show had History/mythology not been tampered with. Whatever Arthur and Merlins story is (real or fiction), it’s been passed down in a certain way of story tell. It’s like tampering with Romeo and Juliet or any such classics. If you want to put a twist to the story line, atleast it shouldn’t be so distasteful. Percival is a 12 yrs old child, Arthur is a mercenary. Why will you do this to them?