In the early 1990s, Doomsday became one of the most iconic Superman villains, despite having a relatively late start in DC Comics lore. But in the DC Extended Universe, he fell flat as a pancake. It was such a waste of a potential mega villain.

I do not remember every detail, but I believe Lex Luthor was the one who created him, instead of his comic-accurate origins tied to the planet Krypton. In the movie, he is made from the corpse of General Zod. Despite Lex Luthor allegedly being a genius, he has no backup plan for the very real possibility that the monster might kill him immediately, which it nearly does before Lex is ironically saved by Superman himself.

Then Doomsday emerges as the real antagonist of Batman v Superman: Dawn of Justice, suddenly becoming a world-ending threat with almost no time to prepare for it.

So it ends up being Superman, Wonder Woman, and Batman fighting him three versus one. While it is supposed to be an epic battle, but it really is not that exciting, except for a few very sexy combat poses from Diana Prince.

In the comics, Doomsday absolutely obliterates the Justice League without killing them. Then Superman single-handedly fights him in a brutal battle that leads to both of their deaths. The movie version, by comparison, is just a messy fight where Superman uses kryptonite to kill Doomsday, which also causes his own temporary death. It is kind of comic-accurate, but it just did not feel right. It was definitely poor planning and impatience, and it arguably marked the beginning of the slow end for the DCEU