Thor's backstory in the cartoon suuuuuuuuuucks. "Screw you, dad, I'm gonna go hang out with mortals on Earth... just because!"
And I wouldn't trade Hank's breakdown for a sanitized version. Marvel's heroes are meant to have feet of clay, after all. The truly impressive part is the work in Avengers and Avengers West Coast afterward that redeemed him and made him a proud, heroic, decent man again.
Pretty much.
If you can't write drama with a married couple, or even contemplate the type of drama a married couple could have, then your imagination is crippled.

Yeah but that's gonna get them the same crap stories whether someone's single or married. So end result bad writer=bad story no matter what their status, powers or situation entails.
But its not that simple. Most writers are somewhere in between "very good" and "bad". Which means what the story is becomes a factor. Decent writers take easy assignements and write good or great stories, and hard assignments and write bad or mediocre stories. It's not all the same just because someone's not skilled enough to write a great marriage story.