His acting chops tho? Nothing has shown him even remotely able to tackle the gritty that's become synonymous with Nolan's Batman. And what we expect out of our superhero movies in general*

They should have went with a lesser name, and given him the movie to produce/direct. He's probably one of the best working directors in Hollywood today, and one of the most mediocre actors still getting work at the same time LOL (helps he casts himself in his own movies tho)

*Elephant in the room being the Avengers series, if they take a more lighthearted tone then Affleck could pull it off but I don't think thats how people want their Bats.