You can still have a "quiet superman movie" and have good action. Imagine having a scene in which the journalist opens up his chest, revealing the Kryptonite core. Superman doubles over, while Metallo WHALES on him, his hand turning into a buzzsaw, Superman breathes frost breath on his opponent, causing his opponent to rust, but Metallo activates his jetpack, dragging a weakened Superman along, who pushes on his foes head into the ground. He's about to save the day, when a stranger in a silhouette shoots him in the back with a kryptonite bullet. And then he crawls around, pulling the shards out like a boss, but at this point, he is bleeding. He manages to cauterize one wound with his heat vision, but needs special care for another wound before passing out. Lane finds him.