10. Continuity With Man Of Steel
Batman and Green Lantern discover one of Darkseid's minions leaving a metal cube, which Batman determines its alien in origin. Green Lantern says, "Alien... maybe this is all connected to that guy in Metropolis." Whereas many of the characters don't know about one another's existence; they're very familiar with one... Superman. Talk about perfect timing or maybe it was part of DC's plan, but Man of Steel has already setup Superman's story, and it can be his reputation to the Justice League story. Considering the property damage and loss of life during Superman's battle with General Zod this would be a worldwide story. The audience would be starting at the same place as these "rebooted" characters; working off of Henry Cavil's Man of Steel, and it would literally be a doorway to the Justice League.