That might be true but Captain America and Thor didn't do big numbers either. Their sequels did much better because of the post-Avengers bump. I'm not sure you can say the same about Batman or not. I mean Batman as a character was already a proven winner prior to Nolan. Batman (1989) was a huge hit. I'm neither a Marvel or DC stan. I enjoy some movies from each and I think some of the movies are crap.
I agree AND based that they were sequels that were successful and wound up being superior to their first movies. Marvel is benefitting mainly because off of their movies build on each other to make a flowing universe, I hope DC follows suit but with a different style to give us variety.
But TDKR got the same bump as well based off of TDK, it actually went on to be more successful than TDK too.
ALL of this is a good thing IMO because we are getting more comic movies, which I appreciate