I think it's important to keep in mind that even though the fan reaction to TDK felt more unanimous, there were haters from the start. Websites created to compile all the so-called flaws and plot holes. http://www.thedarkknightsucks.com/
Yes, with TDKR the fanbase is more all over the place with their feelings, but I think we always knew this would be the case. Once we knew they were ending
the Batman story with this film, it was a very clear possibility that this story was going to go in directions that some fans wouldn't be comfortable with. I wasn't really surprised at all with the divisive reactions to this film.
Granted, I understand many of the issues people have are with execution as well. I just think the whole 8 year gap thing really set a lot of people off on the wrong foot with this movie, I really do.