These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: The Death of Superman
Hilarious in Hindsight: During "Reign of the Superman" a fan commented in his letter that "It's amazing how far comics have come in twenty years. Then Doomsday would have been some monster thrown from Krypton or something". When Doomsday's origin was eventually revealed, it turned out comics actually hadn't changed that much.
As Max Landis "educational parody film" The Death and Return of Superman explains, this wasn't really the attitude of comic book readers at the time. At the time, death wasn't something focused on in comic books, especially the main characters dying. As such, when The Cape himself died, it was a big thing for both readers and people who didn't even bother reading comics. What caused this trope, then? After it happened to Superman, every comic book with a dead character decided that it would be equally cool to return.
Moral Event Horizon: The destruction of Coast City. Mongul and Cyborg Superman killed seven million people.
Tear Jerker: Comes with the territory. Watching Superman's last blows with Doomsday, as his friends, colleagues, and family watch helplessly, is truly heart breaking.