That is the weird thing. In purely academic terms, Dr Manhattan is a deconstruction of Superman (along with Miracleman before him). Essentially, it takes the character out of his normal genre context and shows the mechanics of how it works and how it can't work divorced from the conventions of the genre. It reveals the manipulation.
Man of Steel started almost like that. The essential question at the outset of the film was generally "what place does a man with superhuman powers have in our world?" or "in the real world, would a Superman simply be a monster?"
Honestly, that is a dramatic story that really has yet to be told in film even though the original script for HANCOCK, called TONIGHT HE COMES, was that story before massive rewrites changed it.
However, for Superman, that is not really a story that will ever see the screen in any serious way that doesn't turn out to be an alternate universe.
So, in the end, MAN OF STEEL became a somewhat flawed version of the usual Hero's Journey/Emperor of Everything story we always get from STAR WARS to THE MATRIX to almost any movie today.
But... it actually did something right even though I and a lot of people didn't like how it did it. In the end, Superman barely saves the world and doesn't save a lot of people. What he does is that he makes the choice to join the human race rather than rule as a Kryptonian in the ashes of the world.
And, more importantly, he's still not trusted or accepted for that choice. In the "Emperor of Everything" version of the hero's journey myth or "mono myth," the hero is crowned king and celebrated because he's just simply the best. However, the much more satisfying conclusion is that the hero returns to his tribe (Clark rejoins the human race) and it is the tribe, not the hero, who benefit for it.
I can see why a lot of people liked the way Man of Steel concluded even though it seems like a disaster of an ending. Primarily because the heroic action wasn't stopping Zod, but it was making the choice to fight for humanity even if there is no reward for doing it.