4. Chemistry
Many of us have been waiting to see the members of the Justice League all on screen together by the time we were rewarded with such a thing it didn’t feel like a reward but punishment. The lack of chemistry between the Justice League members as a whole is disappointing especially when the blueprint exists with films like The Avengers and Captain America: Civil War.
Unless the Justice League members where going to be isolated the whole film then chemistry needed to exist. Characters, like real people, exist in a world full of other people with agendas that evoke emotional responses out of one another. The director Zach Snyder mostly overlooked how important character dynamics where in the film with few positives interactions like Barry Allen and Bruce Wayne also Clark Kent and Louis Lane.