As a person who liked history and suffered from mental illness, I found the entire society of Batman Earth One to be too much of a nightmare of corruption and weakness than actually exists in the real world. We have entire nations revolting against centuries of Orwellian dictatorships in the Middle East. US presidents forced to resign in the middle of wars. And near miraculous drops in crime rates in less than a decade because people have had enough.
Then there is Earth One Gotham. It is less a city than a repository of fantasies and stereotypes of hopeless corruption and the foolishness of anyone stupid enough to stick around. Is there anything redeeming about Gotham, besides the unexpected absence of diversity(if you are Into homogeneous urban areas)?
There is also the matter of Batman/ Bruce Wayne. He has no training, no aptitude, no protection for his eyes, no sense of his own physical limits(to comedic effect), and a refusal to check and test his own equipment. This would be enough incompetence to make someone who spends almost two decades getting ready for a simple task of revenge killing someone he just felt like had his parents murdered seem a send up of another character, not a legitimate effort of one.
And then there is the vague catch all of mental illness. We know that he was the child of Martha Arkham, making severe mental illness more believable. The choice to become Batman occurring in his early adolescence also makes it seem more realistic. But, the decade of steady progression of an already severe mental illness should make it impossible for him to function even in the controlled environment Alfred constructs for him.
It is not that each part is unreal. My opinion is that the total picture is too much to be real.
There is no legitimate connection from the first nights as a Bat to the last bits of surprising martial competence. None. And the Bruce that decided to be Batman as a ten year old would be too lost in fantasy and delusion to know where he was, let alone what he should do.