The score for 'Batman Begins' is truly beautiful. 'The Dark Knight' is fantastic and has a very dark, and sometimes scary feel with the theme for The Joker. 'The Dark Knight Rises' on the other hand had this very "Loud is better!" feel to it and at time similar 'Inception'. I do like 'Gotham's Reckoning', the theme for Bane, that's truly a big, menacing, theme for a big, menacing man.
I think the score for TDKR was weaker because it didn't have the input of James Newton Howard.