The pacing is terrible skipping between past and present, we are given incredibly long and drawn out sequences of absolutely everything, not least the drugged out daughter with no personality besides being a twenty something with daddy issues who is strung out in the kind of way that only really exists on TV.
The world logic of the heroic code that Not Superman teaches everyone makes absolutely no sense that they've been holding onto it without any of their friends dying for decades - nobody is particularly invulnerable in this world.
The show also breaks a rule by essentially lying to the audience to attempt to make it more difficult to identify the big bad.
In an absolutely terrible writing decision they show with Not Superman himself talking about social issues like he's a millennial when he's well over 100 years old. We have a man who was in his 40s during WW2 talking about Nazis in the streets of America and how much worse America is getting and how terrible political corruption is. There is absolutely no way anybody who lived through 1920s America or for that matter 1980s America would believe that political corruption and crime are especially bad today.
That could have been left to any number of their children who are all under 30 (even though the old guard is all 120 or so).
The show wants to be deconstructionist of comic book tropes from 50 years ago but not only has that been done to death and better, but it makes no sense with the world building because it's written like a bunch of superheros popped into our world and have to deal with realistic consequences except they've actually had superpowers for decades in the world without facing consequences.
Also, the fight scenes are hokey trash taking itself seriously without the budget or choreography or the plain effort for the audience to take it seriously.
It's a mess, just go watch Invincible or The Boys for way better takes in very much the same vein. Or for that matter umbrella academy, my hero academia, or winter soldier and captain falcon if you're not especially wanting the niche of Not Superman and Friends except realer.