You have to be careful these days in the scifi section. Due to the likes of the Twilight series and Blake books it has been infiltrated by what I call vampire romance chick porn. There are so many terrible authors churning out books about vampire huntresses and the vampires they love. It's ridiculous.
The same thing happened to me once before with the Clan of the Cave bear. It went from interesting anthropological historical fiction to bump-chika-wowow in three books.