Snyder from the start wanted to portray the world as being more realistic than the one in the comics. imo, there are few things more realistic than a parent being loyal to their child above all else.
That's just being Human.
Sounds like, again, the problem is people confusing their anger at the idea rather than the execution.
Batman is a weapon obsessed, fanatical maniac who thinks he is above the law. I don't see how it is surprising at all he kills someone randomly whenever his imaginary moral compass feels like it
Not Kents, not even that "Martha" scene... it's that the man is perfectly capable of adapting the comic source material and almost not changing anything (300 is the perfect example of that).
Yet in DCEU, he has given us horrible abominations such as Eisenlex and Ezraflash.
You could blame the actors and the script, sure, but as the director, he should've had something to say about it, no?
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Then there's the CGI problem. If Warner doesn't have the money to hire good designers and give them the tools they need... then there was absolutely no need to make Steppenwolf a CGI beast (especially since he has a very human appearance in the books) and don't get me started on Teenage Mutant Ninja Cave Troll Doomsday, who should've had his own arc instead of getting shoehorned at the end.
They wanted to rush things in order to catch up with MCU. The results are more than disastrous.
He'd not a good storyteller. If they had told him "Adapt Last Son of Krypton" or "Adapt Death of Superman", then he would have done fine, because the story would have been written for him already. But ask him to come up with something himself, and we get shit like... well, the movies he directed for DC.
I feel like Snyder is at fault for the CGI too. As in, he approved the art department's shit.
I will give him some leeway with Doomsday (though only a little). iirc the one we saw in SvB was supposed to be the larval form, and would eventually become the one from the comics. Terrible design, sure, but I can see where he was going at least.
Some changes. Not all the changes he was supposed to. He just should have started off better is all.
The dialogue? No, but the entire "idea" around the film was his. He wanted the character to be that version of the characters. He wanted to do things his way. Pesky things like dialogue and plot don't get in the way of him making cool shit.