Every discussion for TDK I saw was "what was your favorite scene?". For TDKR, discussion is much, much more diverse. The villains are more menacing, the story tells a great tale of Bruce/Batman's fall and rebirth, while simultaneously tying a neat little bow to the trilogy. How TDKR connected and ended BB and TDk was nothing short of spectacular and the final few minutes are so choice.
People keep talking about TDKR's pacing, but I don't know what they're talking about because TDK had pacing issues galore, and TDKR is more along the lines of BB.
I think a lot of people have rose tinted goggles in regards to TDK. It's a great movie, but putting it on a pedastal like it's somehow better than TDKR makes little sense to me.