6. ...But For A Sequel, Not The First Movie
We need to know more about the characters before we see them neutralised: simple as that. Martian Manhunter is defeated at the start of the movie before we even know who he is or what his powers are. The first Justice League movie needs to tell the origin of the team (if not the origins of the Leaguers themselves in some cases). If Warner Bros. had launched their franchise with this movie, it would be like if Marvel skipped all of its solo movies and the first Avengers film and began with Age of Ultron. Tower of Babel is a great idea to build a plot around, but for Justice League II or III - not to launch the franchise.