Arc Fatigue: Scott Snyder's entire run is one big story, dealing with the fallout of No Justice, Dark Nights: Metal and the death of the Multiverse. While some stories deal with it more directly than others, the entire run is about it and resolving it. To say some people got bored with it and wanted something different is an understatement, not helped by how it technically isn't resolved, since it all leads into Dark Nights: Death Metal.
Fridge Brilliance: Overlaps heavily with Fridge Horror. The World Forger's plans to create a Utopian multiverse to fool the Judges of the Source into thinking the multiverse had chosen Justice was doomed from the very beginning. To get to this state, the Forger and the League tossed every individual who would choose Doom into a planet-sized prison. Including those who hadn't aligned yet, Shayne Jonzz screams that many of the imprisoned were scared, and apparently entire planets were wiped out in this crusade. As our League points out, that's not Justice, merely a sick perversion of it. And on top of that, the Forger's plan hinged on Mr. Mxyzptlk wiping out the normal multiverse so he could strike his Crisis Anvil and replace it with his "Justice" multiverse. So even if the Forger had succeeded, it would have been All for Nothing, as the Judges would have deemed the new multiverse unworthy and destroyed it anyway.
Moment of Awesome: This series is unafraid to embrace the truly ridiculous aspects of DC Comics, be it Jarro, blowing up the Moon to save Earth and then later having Superman rebuild it piece by piece, or setting up a battle between multiversal gods for the battle over all existence.
And then Lex Luthor and Batman turn their respective halls into Humongous Mecha to duke it out. The best, awesome aspects of the Silver and Bronze Ages truly are clearly Snyder's spirit animal.
The above splash page near the end of Issue 3 is terrifying even by the Joker’s standards.
Superman’s Slasher Smile after Lex takes over his body.
The reveal and subsequent conversation in Issue 8 between Luthor and someone he has captured and locked in the Legion's headquarters: The Batman Who Laughs!
Martian Manhunter and Batman destroying the moon to stop the Earth’s crust from breaking apart.
An object containing the energy of the Source Wall itself is coming to Earth. And it has the potential to contain information that will evolve the entire universe.
Lex and Joker shrinking to microscopic size to take over the bodies of Superman and the Martian Manhunter, dispatching Batman and Hawkgirl in the process.
The revelation that Luthor has The Batman Who Laughs locked up in the Legion's headquarters, and the resulting deal to release him in exchange for information regarding the Totality!
J’onn and Lex meet for parlay on Mars where it’s revealed that Lionel Luthor once worked for Vandal Savage and helped him capture a young J’onn J’onzz until J’onn was freed by his best friend, an adolescent Lex Luthor. This transgression spurned Savage to wipe the memories of both Luthors, leaving Lionel a sad man stuck in Smallville who bitterly abused his son for reasons he didn’t comprehend. It’s unclear how much of the story is true.
Win Back the Crowd: This series has pleased a lot of people who were disappointed with the DC Rebirth version of the team.