He did take it, for 8 years. Just because he wasn't physically being chased doesn't mean he didn't take the heat. His name, reputation, mentally..he took the fall. People can't look past the surface sometimes. Also, how do you know if that was it? You think Batman didn't get bombarded by more cops once he got deeper into the city? The chase could have had layers to it, going for a good chunk of the night.
i find it hilarious that people even make fun of these movies. When i look at the movies that came before it, or the comic book movies that have been released since (Iron Man 3, Avengers, Thor 2, Amazing Spider-Man or Man Of Steel which borrows heavily from Nolan)..it's like "really?". Appreciate what you have! They're pretty much the only serious comic book movies around. And im not talking about a couple of scenes you can take serious between Jor-El or Pa Kent, or when Andrew Garfield breaks Uncle Ben's door in a crying fit.
The only chance of Affleck's Batman being taken seriously is if he directs his own movie in 6 or 7 years from now, and even then, it may not happen since it's attached to two Snyder movies where Batman looks the coolest but is basically in a 3D popcorn movie with aliens fighting each other.
Fans diss TDK for other reasons though..
Since Nolan has done this, Hollywood thinks every hero should be the same way. Not everything needs to be taken seriously in the comic book world, or be gritty. So people blame TDK for that. Which isn't fair.