I remember there was a debate in Wizard Magazine about who was the best superhero all around. Spiderman came in first, Batman was second. Based on their very similar games where you get to play as each, I would have to agree.
Sure... but my point was that Killing Joke had been his origin for about 30 years and it didn't take away from the character. If anything he grew in popularity. An origin won't ruin him and it wouldn't stick anyway.
I thought this game handled them better than most others to be honest. Even better than the Ciri sections in The Witcher which I also liked more than most.