I never believed the original Luthor. Every story would begin with him breaking out of prison, finding some giant robot in an old lab he hid somewhere, and then he'd be defeated. My view was if he could afford all those labs and giant robots he wouldn't need to rob banks. I also thought later that Luthor should not have super powers. Every other villain had super powers. Luthor's power was his mind. He needed to be smarter than Superman. Superman's powers had to be useless against him because they couldn't physically fight each other and Superman was simply not as smart as Luthor.