Well a "gloomier" or darker tone might work more with Spider-Man just given that Marvel characters do tend to be a bit more complex.
But Superman is the friggin' prime example
of optimism, hope, and inspiration. He's supposed to be a beacon
of these things in spite of everything he's done, sees and being an alien in an adopted world. It's pretty un-
Superman to see him flying around looking like he's about to cry and then staring creepily at his ex-lover's house listening to her conversation.