The Saga of Darren Shan.
It expresses war, love, jealousy, hatred, character growth and racism in a fun way. You have to say, when humans have these things, it's boring, when it's vampires, it's fun.
Harry Potter.
Same reason as Darren Shan, but for wizards.
FOR GOD'S SAKE I WILL HONESTLY KILL ANYONE WHO SAYS FREAKIN TWILIGHT! I'll bomb any school who teaches it to kids. It DESTROYS literature with it's useless mary-sues and sparkles.