Everyone should watch Blood+. It's as simple as that. It combines action, romance and vampires (chiropterans technically)
What more does a show need? This is probably the best show, not just anime, that I've ever seen. The characters are so amazing and well developed! I loved them so much!!!! Especially Haji, he was the perfect guy. Ass kicking, music playing, gardening, and blood drinking. : )
I almost, not quite, but almost cried when the show ended. I still need more Blood+! but I have to settle for watching it over again. How sad.