2. Joss Whedon
If there's an opinion from anyone on the planet that can cause detractors to shut their trap and 180 their thought process it's probably from this man; the most well respected and hottest commodity in the booming superhero film adaptation business today. Joss Whedon took The Avengers (a concept everyone including myself thought could never work in a Hollywood blockbuster film) and just a hit a grand slam. Recently he took to Twitter to announce his feelings on Ben as the Bat;
Affleck'll crush it. He's got the chops, he's got the chin -- just needs the material. Affleck & Cavill toe to toe -- I'm in.
Joss Whedon is a self-confessed nerd which is definitely why The Avengers worked but more pertinently why his support of Ben Affleck is a pretty big deal. You have the most important man in the genre backing your claim to the role.