I like how Snyder embraces the idea of comic heroes in a different way, while marvel is more about normal people getting superpowers and having fun with it, with Snyder its about more than that, its like a tale of greek mythology and at the same time the story of exceptional beings living in the real world, trying to find their place in this world and making sense of their existence. With the avengers you don't have much of this, they are accepted and forgiven when they make mistakes, they are a part of the world, eventhough they are mostly among them and deal with the problems at their level, their world is black and white and can only function that way or rather the MCU only wants to be that way, which is proven by civil war, it did show that grey areas could lead to conflicts between the avengers even to the point of self-distruction.
I like how Snyder stripped the world down of all previous knowledge of an existance such as superman, it was a world in a blank state when it comes to exceptional beings and then there he was, the man who came from the sky, who could do the impossible, build like greek sculpture, doing good day in day out, saving people for no apparent reason, like he was meant to be. The reactions of the public were to be expected, people feared him, worshipped him, he was something greater than everyone else.
Batman was rightfully afraid of this being, stronger than anything ever seen, he knew noone stays good forever and once superman turned evil, he could level a whole city within minutes, kill more people in a an a hour, than he has been saving since months.
I understand that superman-fans don't like this movie, in a sense it is a superman-movie without superman or atleast the superman that has existed for decades, this man of steel has to build a legend on his own, he has to reach out to a lot of people, he has to experience more eventhough he saved earth twice, this is still his year one.