Despite being in over half the film, I really feel like Superman is just a macguffin in the film. No two bones about it, this is ENTIRELY Batman's show.
Fortunately, Batman is FINALLY awesome enough to carry a whole film himself whereas the Nolan films were carried mostly by their villains. Batman is finally free to make his own arguments rather than form a rebuttal to someone else's.
Unfortunately, despite this being the most true-to-the-source take on Batman yet, I really can't say this is a great film. It's dark, plodding, and depressing, with very little hope to even out the bleakness, which, while a great commentary on our modern society, does not a compelling film make. They say that the night is darkest just before the dawn, but this movie is pretty fucking dark so the resulting dawn is going to have to be pretty amazing if DC wants to sell me on their ensemble Justice League film.
After the morose grimdark of this film and the far-more serious-than-usual upcoming Captain America: Civil War, Suicide Squad is going to be a welcome slice of mood whiplash.
If you have kids, don't take them.