What they're doing is worse than Batman and Robin dude, read the graphic novel and you'll see the changes. It was a film focused around villains.
Comic book villains took power, killed all the superheroes in the world and wiped their memory of being heroes away. Hell, there was even a take on making two heroes believe they were nothing other than heroes on an old television show- ie. Batman starring Adam West. It would have been the first great film with villains as it's only/key characters. This was destined to be the 'Fight Club' of all comic films.
For anyone whose read the graphic novel, they know that it was a hard title to fck up. But, somehow these guys managed to do just that.
I seriously don't understand how the fck someone can get 'assassins' from 'supervillains' unless their either illeterate or just that dumb to fck up the source material that much.