>what's the point of all that shit if superman can just fly down and solve all problems in a split second?
Well, to be fair, he's dead during the events of Suicide Squad.
It appears that DC *is* going the route of making magic an integral part of their universe from early on, and that it's going to have tons to do with belief instead of just being poorly understood universal "cheat codes."
If I'm anywhere close to on the right track, their magic will be something more akin to how Star Wars fans thought of the Force for better than two decades - an energy field that not just anyone can tap into, and even those who can will need years of training and practice to master, and just like any other talent, your skill level will be a function of a combination of that training, practice, knowledge, and inborn natural ability.
Unlike the Force, it's going to be something that waxes and wanes in the world, and will have something to do with a sort of "mystic cosmology" where our "realm's" proximity to other "realms"(like where the "gods" dwell) affects the strength of magic in our world, and, conversely, our own belief feeds the gods, possibly even plays a role in drawing their realm(or dimension) "closer" and more accessible to our own.
Once again, if I'm right, Superman's presence on Earth will be responsible for this latest shift by virtue of becoming a focal point for the hopes and beliefs of mankind, culminating in his his sacrifice, wherein he chooses to embrace not only his role in the world, but also to some degree his actions changing the nature *of* that world, in effect becoming the voluntary ritual sacrifice that ushers in a new Heroic Age.
If the gods are kind, the full info dump will come to us in a future movie, courtesy of none other than Constantine himself.