I recently read an article saying that Superman has the worst villains, sadly it's a very common opinion among comic book fans, I think all Superman fans are tired of the nonsense that Superman has the worst villains, such Once in its entirety its villains are not the best, but its best villains are the basis of DC and the most important in the comics.
The villains are basically divided into 3 levels.
1: local threat.
2: planetary threat.
3: cosmic threat.
1: Lex along with the Joker are the most iconic of the comics (Dc/Marvel), but in the DC universe, Lex is the most important.
2: the most iconic of the comics (Dc/Marvel) is Brainiac, the most important of DC.
3: the most iconic until recently was Darkseid, without a doubt the most important of DC.
As you can see the Superman villains are not that bad. Superman has a lot of bad things, but his biggest villains are the biggest in the comic book world.