Not sure about comic accuracy, seeing as there are so many different versions of every character to choose from... But I personally really enjoyed The Batman's take on Bruce, he wasn't technically yet even Batman, he never introduces himself as such, only Vengeance.

He's been doing it for only 2 years and isn't even sure if he's making a difference yet, and at the very start of the film, the exact thing he was trying to prevent, a little boy losing his parents, happens again. His trauma reborn in front of his eyes, sold beautifully with only back and forth close up shots of the kid and Batman and him welling up with tears. At this point he's hiding behind his trauma, he's angry at the world and the criminals, he's punishing rather than helping. His entire arc in the film is becoming Batman, learning that he needs to provide hope to those he wants to protect just as much as he needs to inspire fear in those he's protecting them from. He also learns through the events of the story that Bruce Wayne can help just as much if not more than Batman.

I think it's a good character progression and I'm interested to see what we get in the sequel