Re: Darkseid can be used in a Superman movie!
The problem hardcore fans have with using Darkseid is that, in comics, Darkseid is exponentially more powerful than Superman. Darkseid is to Superman what Superman is to you and me. It's that dramatic. For Superman to 'not hold back' and beat darkseid is just as ridiculous as you or I beating up Superman with our hands because we 'didn't hold back.'
Almost anybody in a Hellboy/Thing-styled suit could play Darkseid... I personally would suggest Michael Clarke Duncan.