intothevoid
Super Freak
The ideal scenario would be a Bruce Wayne Batman who is a badass, distrustful of the other members of the League with super powers, and constantly out-smarting everyone. NOT the emo wuss of TDK/TDKR who will quit at the drop of a hat.
If Batman is going to work in a JL film, he needs to be BATMAN, damn it.
I don't see how Bale Batman can't be distrustful. His mission was to setup a legend for Gotham that will outlive him. He succeeded. He retired.
Now Superman brings to his attention a whole nother level of threat to the existence of humanity. He is forced to do something about it - and he would naturally want to keep an eye on Superman and other super-powered JLA members too as all of this meta-human/alien stuff would be perceived as a threat to any normal humans.
I see no reason why it couldn't work well, as long as it's written well.