Bane never held a grudge against Ras, probably because he saved his life and gave him a purpose. Loyalty to the League.
I guess that's a basis for the loyalty but it still felt weird and excessive that their visions and plans were so similar, especially as it was unclear why Ra's excommunicated him other than that he loved his daughter and why that was so bad (unless it was that she was too young) and why that wouldn't cause more resentment from Bane.
Why does Bruce choose now to come out of retirement? Um did you watch the movie? Bane and Catwoman weren't good enough reasons? He was looking for a big excuse to return as Batman and possibly die in the cowl. Bane made it easy for him.
Bane was built up OK but not quite convincingly enough-he's big, he's got skills/training, he has supporters or even an army, but all he does is (aside from organizing a kidnapping), pretty much on his own, attack the exchange (then he went to Catwoman to find what she had done with his finger prints, admittedly personally important). I had a hard time believing that something similarly bad had never happened in years, that that was enough to risk being hunted by the police (and thus hurting his own mission) and that later he was so overconfident he thought he could just beat Bane and the rest of his group too so soon after returning.
Catwoman was far from threatening or a big problem although it was weird and another flaw that Batman was so confident she could be trusted to lead to him to Bane in a helpful way, he felt she knew enough and dealt enough to know where he was but not to trick him either out of greed or her own safety from Bane and his group.
That Bruce actually had a death wish, which Alfred thought, seemed possible but not clear and too extreme a reaction to losing Rachel but doing a lot of good for the city. Helping the city again economically after he learns its problems should have been reinvigorating enough, why does he just reject Alfred's idea that the city needs his mind and resources more than his body?
Bane's speech about corruption was true in many ways but he used that to get the people to understand and then fear him.
It felt pretty cliched and opportunistic-populist to me and again he's so clearly malevolent and unreasonable it's really hard to take it seriously.
Of course it would be damaging for Gordon's reputation. What he lied about was a huge deal.
There would be some damage but even from the text it's clear he felt anguished about it and mostly hurt himself in lying about Dent nearly killing his son (and there were other deaths but that wasn't emphasized, actually not specifically referenced, just "appalling crimes") and wanted to and was getting ready to tell the public the truth (and resign from his power position for having lied before), rather than someone who casually or greedily lied about injustice to other people (and it's also a leap that Dent actually being bad and that being lied about meant the prisoners were being oppressed).
Well, showing Bruce in a negative light was the point really. Rachel WAS his only ticket to a normal life. He thought that way since Begins.
But he had dedicated so much before to helping the people and even after got pretty involved in the energy project (I guess learning it could be a terrible weapon would make him more cynical but not enough to both become totally reclusive and not notice a stark decline in his company's and foundation's wellbeing, to think that because Batman wasn't needed anymore the public didn't need him in other ways).