Batman Begins. Even though I think The Dark Knight is the better made film, I still enjoy this one the most, maybe because I prefer the theme of fear, and because I just liked seeing Batman's origins.
The Dark Knight. It's a bit eerie to watch this one now given recent events, and it's hard to hear Joker say certain lines and not think that guy probably thought those same things and got off on it. Well, none of that takes away how great this movie is. The tension just builds and builds, almost like it were a drama first and an action film second.
The Dark Knight Rises. I liked it a lot, probably more than The Avengers (which is funny because when Iron Man and Dark Knight came out the same summer I liked Iron Man more). From the commercials I wasn't sure I was going to like Catwoman, or The Cat, but I did.
I wondered a couple times to myself what was the point of Joseph Gordon-Levitt, but the reveal at the end wrapped it all up for me. And the twist revelation of Talia Al Ghul really surprised me. On a side note, I did think it would have been more appropriate to the character of Batman if he just died, but I get that the final scene also made sense for both Alfred and Wayne so it still worked for me.
Edit: Way too many spoilers, man. -Coheteboy