Words fall short to describe it. It's basically a piece of brilliant art. Snyder has his unique views and portrayed it beautifully. Not always the world see eye to eye with his views but that has always been like this for legends.
Watched both the theatrical cut and the Snyder's cut. It's at least 80% different from the theatrical cut.
The previous one didn't explain what are these para demons and how they were created, what exactly is Steppenwolf's agenda, how did Dianna know so much about steppenwolf and many more other points. But this movie describes everything and answers all the questions.
There's plenty humour if you watch it mindfully. It's not a comedy movie so don't expect the heroes to sit at a bar or cafe or round table and joke around. The world is in danger and they have little time and resources to save it. There will be pain and darkness when a movie shows love and loss and human emotions.
So if you prefer a light movie that has simple storyline with no depth and bright sunny days to relax mindlessly then I suggest against watching it. A lot of work goes into each and every frame and not every movie is a fairytale. There are other movies in that specific genre.
And if you do decide to watch it then don't keep a notion of how a superhero movie should be. As this movie is simply brilliant in every aspect. So honour it that way without comparing it with anything else.