Totally agree. This is indeed one of the best shows to appear on Adult Swim in a while (well, it and Crayon Shin-Chan).
Diva is seriously disturbed, but who ever said that was a bad thing? Saya, on the other hand, needs to step up a little more. Until her inner self gets released, she's an indecisive waif.
The sexiest girl, in my opinion, is the blond scientist lady. She has an air of maturity that has yet to be matched.
All in all, Blood+ is a great show, filled with bloody fights, great music and authentic emotion.