Kinda depends on what version we're talking about.
While the action in most superman stories is boring, 'cause he's basically God(didn't he fight and beat Death at one point?) I fully admit his arcs are less about the struggle, and more about the morality of the struggle. He can literally change time on a whim and is more than capable of destroying the Galaxy in a few seconds(again, depending on which version...) yet all he seems to want is a few close friends, a quiet-ish life and some Lois Lane poon. Legit, if boring.
Supergirl I can mostly tolerate, especially when teamed up with Batgirl, but oh god save me from Valley Girl fashion Bubbles Supergirl. I can't tolerate a 'serious' heroine who's greatest weakness is hunky boys with blonde bangs, and cuddly kittens name Bojangles. I like her when she's a more earnest, naive, but charismatic superman. Save the world first, then ask questions about the morality of not letting the humans save themselves for alien space scorpions with nanobot guns and laser balls second.