Lex, in my mind, is most likely to stab you in the back. And yes I am keeping in mind the volitile nature of Joker when making this statement. Can you blame anybody else but Lex for his low popularity?
Lex joined the Justice League, he has no right to call himself a villain, I'm kidding people are going to be jumping on the bandwagon once Apex Lex makes an appearance in game.