I’m a casual fan when it comes to Superman. Johnson is too one-note imo. I can’t see him conveying the genuine kindness of Clark Kent or Superman without trying to put a vapid cheeky, edgy, or ironic spin on it. The stakes of Superman often don’t come from what can defeat him in combat, but what can destroy what he cares about and his ability to defend it. Also, I don’t think the iconic hairstyles would look right on Johnson’s head since he’s known for a bald or short-haired look. Another commenter mentioned how Johnson has more of a bodybuilder form, which seems too exaggerated for the character to me as well. I thought his portrayal of Black Adam was fine, but it’d be weird seeing him switch to a foil character in the same general franchise (but different universe) so soon, not that other actors haven’t successfully made that switch themselves.