Metallo is lame.
Kryptonite in Superman movies is soooooooo overdone. It's just used as a crutch for bad writing. "Instead of thinking really hard and creating a real threat to the man of steel that would provide excitement for the audience...let's just keep using that green rock."
Lame.
I'd much rather Superman go a few rounds with someone who is his physical equal without that whole. "Ohhhh, the pain it hurts...please turn the green light off" Scenario. Metallo in my eyes has ALWAYS been a weak villain. He just can't stand up to Superman's raw power, Superman has over a dozen powers...All of which he could use to to tear metallo a new oil hole.
Eradicator, Doomsday, Luthor in his Armor...those are cool concepts. I just want Superman to stop being Lame in movies.