Prove me wrong.
Easy. When your complaint about criticism boils down to "lol you don't make movies, so how do you know!" it's weak shit. Otherwise no one could complain about anything.
Eisenberg is a good actor, was great in TSN. Nothing he has done suggests he's a good fit for Luthor. Hanging on Ledgers nuts does not change that (and I was never against that casting anyway). Could I be proven wrong? Maybe. WB's track record suggests otherwise though.