Connected universes are certainly a hard concept to master. The only true measure of success from one that we've seen in our lifetime is the Marvel Cinematic Universe (MCU), which has had its own ups and downs among its undeniable achievements. So much so, that Marvel's comic counterpoint, DC, tried to replicate it, but ultimately failed. While Zack Snyder's Man of Steel launched the DCEU (DC Extended Universe) with a fair amount of praise and excitement, its sprint to get to Justice League just a few years later left fans conflicted about the direction of this universe. Not to say every DCEU entry was a complete disaster, as it eventually led to renowned MCU writer/director James Gunnshifting his talents to the competition after being fired from Disney. Of course, that firing did not stick as Gunn returned to finish out the Guardians of the Galaxy trilogy, but this move resulted in making DC his permanent home, and this troubled connected universe his mess to fix.