I don't need to know anything about the other Blood series to tell that Blood-C was mediocre though. Some of the fight scenes were neat and had some good animation but it wasn't worth slogging through the rest of the series for.
Nah man. New Lupin has lots of tits but I'd argue it's not fanservice, or at least not done in an obvious "here's tits for no reason give us all your money" sort of way. The show actually has solid animation, a great artstyle, really good direction, etc etc. It's just really well done.
I do need to watch some old Lupin though.