There were two montages I liked:
A beast of a shirtless Bruce Wayne training to fight Superman.
and
Superman actually saving people. That scene with him floating in the sky over a flood, with a woman reaching out to him, is aces. A real god among men.
Yeah, that's he problem. It's just... there. It starts after a normal scene and is pure insanity with parademons and Batman gunning people down, Bruce wakes up at his computer with Flash screaming at him about Lois, he wakes up a second time at his computer and decrypts some files.