Wow. Although I read quite a few comics there are only a handful I can say I really love: Jimmy Corrigan, Fatale, maybe a few later Grant Morrison works. I can honestly say The Killing Joke is the most impressive Batman comic I have ever read. More interesting than The Dark Knight Returns and somehow more violent than Year One - I'm not sure how it manages this. The art is unbelievably good and the writing is able to balance subtext with organic story development.