Just watched it. Really enjoyed it! It's so good seeing all the crime going on before the Batman series/films started and how it lead onto that.
It was brilliant seeing the villains as youngsters...Posion Ivy, Penguin, Riddler, Catwoman, and I would say the comedian is the joker, BUT is that not too obvious? I heard that the Jokers reveal will be surprising, so maybe it will be a character (a good guy) in the show who we won't know by name, or goes by a different name, who won't turn evil until after?
With me, I have only watched the films, not the TV series/cartoons/comics, so I am basing it on original films. So I am a little rusty on some of the history. So, Barbara is at the moment James' girlfriend, yes? They will get engaged and she becomes Barbara Gordan... but then what throws me off track is the cheesy Batman and Robin with the introduction of Batgirl.