Well, I just finished watching the first time through. The guys were *pretty darned* creative, I'll say. In this storyline, there ain't nobody else, superhero-wise, on the planet. At least not mentioned at all in this story!
Superman keeps his moral code intact in the end, except the part about keeping his pants zipped before marriage. Of course, we have Superman: The Movie as a precedent!
Actually, several incidents and "camera angles" are deliberate homages to that film.
I did notice, on the very first viewing, ONE BLOOPER.
During the big fight between Doomsday and Superman in Metropolis, after a while they take it underground, as in onto the subway tracks. At about 23:40 into the film, Doomsday knocks Superman up from the subway, through the street, and into the side of a building. Superman hits the building horizontally and rolls toward us. The blooper is, the“S”-shield on his chest is mirror-reversed as he rolls toward the viewer.
This is a quick faked-up shot to show you what I mean.
Anyway, it's pretty good overall. However, I wonder why Perry White can talk about Superman being there to save Lois's "ass," while LuthorCorp can only stick up probe up Satan's "rectum."
Anyway, it's pretty creative and pretty darned good. You can see in advance what "has to happen" storyline-wise in a place or two, but that's just the way it is with serial fiction, folks!