Maybe the criticism comes from actual problems people had with the film.
Here's my breakdown, and feel absolutely free to pulverize each and every part you may disagree with:
What I liked:
1)Heath Ledger
2)SOME of the action sequences
3)The Score
4)Rachel Dawes' Death
What I didn't like:
1)The editing and camera-It felt like they cut a 3+ hour movie down to just under 2 hours and 40 minutes and on top of that some of the action sequences and shots could have been better edited and shot.
2)The third act plateaus
3)The ending is terrible and doesn't make sense
4)Rachel Dawes-I hated this character, she was poorly written in begins and it carries on here.
5)Two Face/Harvey Dent is under developed and makes a 180 too quickly.
6)Things don't make sense such as Batman and his girlfriend survive a fall on a car, Rachel says the best place to hide is the SAME penthouse where she was attacked, a cop stands INSIDE the interrogation room with an uncuffed joker...I can go on...
7)Batman...his voice, performance and writing...
8)The writing in general is pretentious, and is handing me the script with the characters analyzing/talking about everything...
9)The cell phone device was an awful and aggravating plot device
10)The boat scene is ALSO just plain awful and aggravating.
11)Watching Chicago rather than Gotham, seriously, where was the atmosphere from Begins?
12)No Bat Cave
THIS.
I like to have SOME stuff open to interpretation, rather than being told EVERYTHING about the film's morals, ideas and meanings.