Complete Monster: Superboy-Prime continues to ratchet up his bodycount in this story, slaughtering fifty-five Green Lanterns, poisoning Sodam Yat with lead, and ultimately trying to kill every hero in the DC 'verse during the brawl, all while attempting to blame them for his actions.
Crosses the Line Twice: When Superboy-Prime rips off Risk's arm in Infinite Crisis, it's sad and horrifying. Risk returns in revenge here and Prime rips the other arm off in response. It's kind of funny.
Crowning Moment of Heartwarming: When Hal tells the citizens of Coast City to evacuate, because Sinestro and pals are about to blow it up and take it over again. And how do they respond? Every single one of them shines green lights out their windows to encourage our hero. Then there's the news broadcast later on to recap the epic heartwarming.
"And when every other metropolis under threat was evacuating, there wasn't a single car or a single person that left Coast City."
Magnificent Bastard: Sinestro orchestrated the entire conflict to get the Green Lanterns to use lethal force and succeeded.
Many people complained about the logic of Sinestro picking Parallax, Cyborg Superman, Superboy Prime, and Antimonitor as allies, but it makes a certain sense — each is individually powerful enough to be a threat, both to the enemy and to Sinestro, but they're bigger threats to each other than to him — Sinestro can effortlessly dominate Parallax, Superboy Prime and Antimonitor would eventually come to blows, and the Cyborg Superman works alongside the Manhunters, whom Sinestro's clearly compromised at some point.
Narm: Mixed with Awesome: Hal and Kyle have their rings drained by Manhunters on a roof. Kyle asks Hal what should they do. Hal quips, "We improvise." Cut to Hal and Kyle making Spider-Man -esque leaps off rooftops.
And then later when his shattered robotic skull is reclaimed by the Manhunters and brought back to 'life', all he can do is silently weep.
What Could Have Been: The commentary in the second collection reveals that Parallax was going to take over Guy and John in addition to Kyle. This was rejected because it distracted from the rest of the story and would've led to Villain Decay by making him less unique.