They didn't explore it as much as I thought they should. Batman created Bane, indirectly, and in some ways attracted Bane to Gotham which set off the events that lead to all of Arkham criminals being released. Which in turn led Arzial to Gotham. Which brought about the events of Contagion and Cataclysm which lead to No Man's Land.
So in a way the entire city of Gotham was brought down by him being there.