Superman is in a different wait class then Batman. Batman is STREET LEVEL, he hangs with guys like Punisher, Miles Morales, Wolverine, Captain America, and Dare Devil. The highest street leveler is in Peter Parker Spider-Man's class. Superman is a COSMIC LEVEL he hangs with guys like Hyperion, Silver Surfer, Thor, Beta Ray Bill, Nova, and Sentry. Of course people like Superman will destroy Batman, just like Spider-Man(a high end street leveler) could speed blitz Batman, and punch his head clean off without any trouble. You're saying that Superman is OP, but the truth is he's not. He can't solo Galactus, he can't outrun Death like Flash did, and sure as hell can't even step in the presence of high end reality warper like the White Phoenix who, i might add held the UNIVERSE in the palm of her HAND.
Now THAT is OP.