Director Edgar Wright exits Marvel's 'Ant-Man'

That may very well be because the world surrounding those characters are grounded in a sense of modern reality. Marvel somewhat pokes fun of themselves and the characters by having people use cell phones, modern technology, current events, and modern settings as sort springboard for the emergence of these classic superhero characters. In cases such as Thor, they play off the folk lore myths, for Black Widow and Hawkeye the spies in a post cold war era. And both Captain America, Iron Man, and the Hulk, scientific advancements for bettering the human condition... That's how I think it works better than Warner Brothers. Don't get me wrong though, the Batman movies were greatly grounded and should be commended for their seudo-realism as well. It was just a lot harder to pull off with an invulnerable character such as Superman, who can pretty much do anything. If they added other superhero characters, or hinted that Superman wasn't the only hero out there, whether in some scene with social media, an article on the front page of the Daily Bugle, or something along those lines as an easter egg, it might be a lot easier to transition in other Justice League characters.