Re: Who should be the villain in the sequel for Man of Steel?
For the sequel they should have Lex as the main villain, angry at the destruction of Metropolis and the power wielded by Superman decides to research and create supermen to counter any more potential alien threats. He ends up creating Metallo, and Parasite who become the secondary villains for the flick. Superman ends up taking down Metallo and Parasite but is unable to gather evidence against Lex.
For the third the villains should be Lex with his mechsuit, and Brainiac.
Darkseid is best used in a Justice League movie, along with Doomsday.