I read Brave New World expecting a dystopic society, but failed to understand why the world that is described is dystopic.I'll quote a passage from the Wikipedia article on it that expresses just one frightening aspect of the society described in the book.
Natural reproduction has been done away with and children are created, 'decanted' and raised in Hatcheries and Conditioning Centres, where they are divided into five castes (which are further split into 'Plus' and 'Minus' members) and designed to fulfill predetermined positions within the social and economic strata of the World State. Fetuses chosen to become members of the highest caste, 'Alpha', are allowed to develop naturally while maturing to term in "decanting bottles", while fetuses chosen to become members of the lower castes ('Beta', 'Gamma', 'Delta', 'Epsilon') are subjected to in situ chemical interference to cause arrested development in intelligence or physical growth.
http://en.wikipedia.org/wiki/Brave_New_World