I'm excited more because of the potential, the potential that Begins had and mostly blew, but can still be saved. When you pair Nolan's understated direction with poor writing, there isn't much there. If Goyer was writing this one too I wouldn't be half as excited, Gotham's reaction to Batman is where it really deserves something better. It's all down to better execution of some great ideas, so far it sounds as if Jonah's grasped all the most interesting repurcussions of Begins: copycat vigilantes, media interest, identity, criminal groups vying for territory, gradual acceptance by the police, everyone trying to understand and exploit Batman. I don't think Goyer would be able to juggle something that complicated, if he even tried to. Begins had such a simple job, show how Bruce goes from A to B to C to become Batman, and stills feels extremely rushed, resorting to speeches to get exposition across quickly
Maybe the overly simplistic motivation Bruce had to become Batman will turn out well, they can show how naive the idea was. The only way they've attempted believability so far has been explaining a few logistics and filming in a real city, it's so derivative in terms of plot and characters. The only remaining worry is the generic superhero music Zimmer produced, but it did match Goyer's script.
The darkness of TDK should be about the uglyness of everyone's character, rather than some divide between the saintly (Gordon, Rachel) and the cartoony bad guys (the mob). Joker calling his terrorism a "social experiment" is encouraging, maybe that'll provoke some real reaction and complications when things get tough...betrayal, guilt, ambiguous choices, bad actions committed through good intentions, permanent horrible consequences etc etc