my critique was clearly focused around visuals, aesthetics, and tone.
I gues this is matter of taste ...
Personaly i kinda dislike that many directors working for Warner Brothers, making adaptations of DC comics ... seems to think that they are creating "dark atmosphere" by just tuning the lights to minimum.

To me what is happening is much more important that how bright colours are used to picture it.

You used happy tree friends as an example ...
I would use last season of "The Boys" as mine.

There were also some
cute animated animals ... one could even say it was
pretty close to Disney style ... and yet, it was pretty grym when they decide to start
darker tone (this image could teoreticaly be a little drastic for some people, so open at your own risk) ...
On the other hand, Happy tree friends ... even tho they pictured some serious injuries ... were never really serious, it was all pictured as a joke, no injury or any other serious topic that was pictured there, had any lasting effects, and in some specific cases those animals were hurting themselves just for the punch line.
That isnt really "dark" theme at all.
