I think this can be said of a fair number of Nolan films (let's throw Memento and The Prestige on the pile for starters). He's got more sympathy for ideas and puzzles then wringing tears from the audience.Again compare Bruce's grieving for Rachel scene with Inception's final reveal of how Cobb knows the act of inception is possible - these should both be heart-breaking scenes, but they feel cold and intellectual rather than emotional.
Which is alright for me, none of the Batman films have been affecting emotionally and doubt that'd change. The staticity of the superhero scenario is part of the problem - The Dark Knight can only kill lower rung good guys, and Rachel Dawes is so dispensable as to make her very death irrelevant.