Oh, I understand her motives. Her character just made no sense.
- She never forgave her father, and yet she cared enough to want to blow up 12 million people to avenge this man that she hated? Fair enough point, but is it hard to believe that there was a love/hate relationship at play?
- Why did she want to blow up Gotham, exactly? Her father wanted to unleash chaos upon the city to make a point: that it was corrupt and could not be saved. She just wanted to blow it up. She'd been indoctrinated into her father's ideals, and had the added impetus of wanting to exact revenge on Bruce Wayne for killing her dad. So in a way, she had even more motive than R'as did.
- Which brings me to: why wouldn't she just blow it up right away? What was the point of having the bomb on a 50+ day timer? She never expected Batman to escape the pit and come back, and she wasn't trying to make a political point. I feel like this complaint is much more common than it should be. It's the entire concept of the Lazarus Pit as EXPLICITLY explained by Bane: you can't have true despair without hope.
- Why did she keep her identity hidden? There was literally no reason, other than to manipulate the audience. There was very clear reason. If she introduced herself to Bruce as Talia Al Ghul, do you think he would have ever entrusted her with the nuclear energy machine in addition to the entirety of Wayne Enterprises?
- How did she/Bane have control over all of the criminals? Did they not care that they were going to get blown up by a friggin' nuke as well? Why would they not rebel? Would you rebel against someone who not only freed you from prison but has turned Gotham into a playground for crime? Many of them were probably ecstatic.
Other random complaint:
- How did 3000 cops with pistols overpower 1000+ criminals with assault rifles and tanks? Batman?