The length of the movie has nothing to do with the quality. As long as the movie maintains it's momentum, I wouldn't mind a 3 hr movie.
TDK lost it's momentum after the Joker blew up the hospital, all that stuff afterwards, the folk on the ferries, Batman taking down the swat with his magic goggles on, it just wasn't as engaging to me as what had already taken place, so I found time dragging a bit up until the end, it wasn't cause of the length, but because it wasn't as engaging in the last act.
I honestly don't have any concerns about this movie, apart from the usual gripe about getting decent action out of the cumbersome bat-suit.
i have to say i love that drawing of AH in the cat suit on the previous page, lol, i want that on a t-shirt, in fact , i want that on a set of pyjamas.