I think TDKR was more "ground breaking" than an awesome story. Kind of a trailblazer. It was the first I'm aware of that showed two folks like Superman and Batman probably wouldn't get along given their world views on justice and methodology. It was the first story I read that implied the Joker and Batman needed each other. Joker needed Batman because only Batman presented him with a real challenge. That only Batman gave what he did any meaning. That, in a way, Joker loves Batman. That Joker fills Batman's desire to justify his obsession, and do what he does, the way he does it, instead of say: joining the police force. These are both themes that have been in the Batman mythos since, that weren't there before.
My main objection to it is Miller gave Batman so many plot devices in his fight with Superman, (Bats powered up, Supes powered down, Help from Green Arrow, easy access to kryptonite, etc..) that some folks still reference it when they want to argue that Batman could beat Superman in a fight. Usually not even aware of all the circumstances that Batman had to have in his favor to even have a chance. (I'm talking more debates on Facebook and such, and not here on the Vine.)
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