Watching the "Mad Max: Fury Road" trailer makes me wonder about the Justice League movie which was almost directed by George Miller. I read the first draft of the script a while ago, and it was pretty good, albeit overstuffed. It combined quite a few elements from "Infinite Crisis" into an overall decent script which would obviously be polished further to remove some glaring issues.
The script did have a few really awesome scenes including the final battle with the OMACs, a very well written sacrifice by Barry Allen and the absolute highlight - a fight between Superman and Wonder Woman (with Aquaman and Martian Manhunter for backup).
Wonder what would have happened if the writer's strike and a weakening dollar had not prevented the movie from being shot in 2007, all the actors, cast and crew had already gathered to shoot in Australia before the plug was pulled.