I'm not totally against an "evil" Superman story, but it has to be done right, and the way Snyder tried was totally wrong, and just too soon for an story as dark as that. You are right, you try an story as that after many episodes (or a few movies) and only after Superman has been very firmly established as a beacon of hope and love in the world. I simply can't accept Injustice Superman or any variation of that as a good story for Superman. At least not for a mainstream story. Elseworld is ok I suppose.