>>149497756 (OP)BTAS' Batman wasn't just a brooding machine, and he wasn't tormented 24/7 by the memory of his parents. Sure, there are episodes where that's the main focus, but it's usually triggered by something in the first act. It's even more obvious when he's Bruce Wayne, you honestly believe he enjoys his public persona, and it's not just an act. As Batman, he could smile, even laugh, and he had no problem working with others to achieve his goals. For example, after Catwoman kisses him for the first time, he lets out a playful whistle.
i.e., Batman was allowed to be a fun character.
TNBA's Batman, on the other hand, is turned into a full-on brooding machine. He never smiles, never has a moment of peace, and isn't allowed to be funny in any way. You can tell he'd rather kick everyone out of the Bat-family just so he can keep brooding (which he eventually does, as seen in Batman Beyond). The best example is actually in the Superman: TAS crossover episode "Knight Time", when Tim and Superman watch a video message from a mind-controlled Bruce. The weirdest thing Tim notices is: "Have you ever seen him smile?" To which I can reply: yes, many, many times in BTAS.
Justice League and JLU reversed the damage a little, but deep down, he was still the same brooding TNBA Batman, which is the version they used for the Justice League stuff, unfortunately.