That's the thing though. When he meets Batman, we didn't even see Metropolis' underworld before. And the story ends with Superman agreeing with Batman that basically Batman is more qualified than him to clean Gotham, which we saw as a very bad place. So it's hard to dismiss Batman as just being defensive, when the story is mostly leaing toard his point of view.
Morrison's "genius" wasn't in telling us Superman improved Metropolis, but in showing, notably by showing us that Metropolis was a pretty bad place.
As for the contextualization of Superman's populism in "Truth"....I don't see it that way. True, he didn't choose to expose his identity and the motorcycle is more a choice dictated by circumstances. However, nobody forced him to come back . Nobody forced him to leave Alaska, nobody forced him to check on his neighbourhood, nobody forced him to go help with the Shadow Monster. Clark could have decided to sit this one out until he figured out what happened to him, and frankly, it would have been hard to blame him. Instead, he jumped right back into the fray, to protect "his home". There's been scenes of Superman interacting with children in the New52, or fighting for the little guy. But yes, the secret identity is a bareer, by definition I want to say. Because the secret ID means he never shows his complete self to anyone. But the point is, even in dire circumstances, he didn't change. What did are his opportunities of interactions with other people. And even then, it's less about how he interacts with other people and how other people interact with him.