Darker Than Black is one of my top favorite shows of all time. Season one especially had an unbelievable soundtrack, a great storyline, good character development and just amazing style. The second season was great too, but the soundtrack was not of the same quality and Hei was nearly the polar opposite of the heroic selfless character of the previous season. Also season 2 kind of felt like a six hour long movie, while season one has several side plots (not to mention 13 more episodes). All in all though the show is one of the best. Now cross your fingers for season 3!!
PS- Season 3 subbed AND dubbed