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This God story is part of the DCU mythos, so why not instead of 'whining' and talking about how they don't know comics, why don't you go read them yourself? Because the only person that doesn't know anything seems to be you.
The DCU mythos have played big on the whole 'Men among Gods' phrases, I mean for fucks sake they released a game called 'Injustice: God Among Us'. I don't see that as being 'grim dark' because its part of Superman comics and general opinion of the character. I think in this situation you don't understand what grim dark is, its when they adapt something and make it 'grim and dark' when it isn't. There is nothing 'dark' or 'grim' about the words 'False God', its a statement.
Hey, you might dislike Zack Snyder but he has made a few of the best adapted comics to movies including Watchmen and 300. If you dislike his style, fine, but saying its a bad adaptation because of 50 seconds of footage is laughably bad and just shows your pathetic Marvel loyalism. I think a lot of people agreed that Man of Steel was shot really well and his directing behind the camera was well done, especially the fighting scenes. I think the general opinion was that the story needed work and so they got a new screen writer.
As for you not thinking there would be a population of people that would think someone like Superman (an alien that came from the sky that can fly, shoot heat beams, saves people) wouldn't be thought of as a God is weird. Like, it seems that you don't talk to many people.
Find it puzzling that you talk about 'grimdark' then mention Daredevil Netflix show as a good example of where DC should take these movies? Daredevil on Netflix is the definition of Grimdark. Daredevil in the comics didn't torture people, heads weren't slammed off of bodies. They went over the top, now that is grimdark.