Originally Posted by \S/JcDc\S/
You would be wrong about this one. No offense. As I said, it depends on how it is written. Brainiac to me would not require a ton of screentime as he can appear as AI that reaches out to Lex initially. Save his final reveal for a battle at the end. Metallo could be the test subject so to speak and first physical villain for Superman. It would work, again... if written correctly.
But I don't want Brainiac to just show up for a final battle. I want an entire film to build him up and make him a threat.