Vastly improved lead-in stories, especially for Cyborg, WW, Flash, even Steppenwolf.
It's long but it should have been a 2-parter in the first place. There's plenty of spots to take a break at.
I actually cared now what happens to the characters. It's engaging and darker, without the cloying, predictable, tension-breaking jokes.
It'll never please everybody, given how fashionable it is to hate on DC films, but it's a solid, enjoyable film for fans of the genre