I only got hooked on DC last October or November, I think. I'd just finished watching all possible Shakugan no Shana and Zero no Tsukaima stuff, and the Pokemon anime (I personally hated everything after season 9) was getting boring. Then the guy I liked recommended DC to me and I decided to just give it a try. At first, I thought the characters were ugly, but then I got addicted to the plot by the end of the first episode. From there, I watched every episode up to 140 and most of the others after that, all the BO episodes, and all the movies and OVAs. I never read the manga though, but the Sera arc is getting me to start reading it.
Well anyway, I guess I have my bf to thank for introducing me to DC. I think DC's the thing that got us to talk to each other more, and for now, I have my happy not-so-ending with him :]