Um... "You die being a hero or live enough to become a villian" ? "If you're good at something never do it for free" ? "We stopped checking for monsters under our beds when we realized they were inside us" ? "In their last moments people show who they really are" ? "I build my own luck" ? "Why don't we cut you in little pieces and throw you out to the dogs? This way you'll see how loyal a hungry dog is" ? And those are just SOME of the messages sent by Batman, Joker, Harvey Dent, etc. So please inform yourself before claiming something. I'm not saying The Avengers wasn't good because I loved it. But I also loved Batman and this last one has more messages than Avengers.
In my personal opinion, I prefer the Batman movies. To me the Avengers seemed unusually bright and lighthearted whereas the Batman movies seemed more believable.
Just my opinion