I agree with you some. I do think that Heath Ledger played an amazing villain. The best of all the Batman movies in my opinion, if not all of the super hero movies. I loved the Dark Knight, but I do believe Dark Knight Rises is a better movie. Sure, Bane, however good, was no Joker. But the overall writing of the movie was damn good. There's a reason that it took two years to write the screenplay. I have a copy of both the Dark Knight screenplay and TDKR screenplay and TDKR is so perfectly written. The DK was simply written. It just had a great cast to pull it off. I studied film in college and TDKR is the best trilogy ending I've ever seen and is the best written feature length screenplay I've ever read.
I hope to God that when they do a spinoff, which will happen, that it does not spit on Nolan's masterpiece trilogy.