Justice League Hero Logos and my review.
The movie isn't entirely bad. Like porn, you still get boobs, a lot of boobs. That's how it is, it just cuts straight to the action. You see all your favorite DC superheroes in their cool costumes showcasing their different super powers (being rich is a super power) in all its glory.
But as it excels visually, it falters in story. There is no coherent story to drive the character to act the way they did. Unless you read the comic books you wouldn't know why the villain wanted to conquer earth. They also failed to show enough motive for the other superheroes to join Batman and Wonder Woman to fight. Its not like Steppenwolf went to a city and started killing people to convince the others to join them. Not to mention the lack of a decent backstory for Flash, Aquaman and Cyborg to make sense of it.
In short, it was hard to relate to any part of the movie to make me feel anything.
Like a good movie, you need to warm up your audience to get them invested enough to care.