PC Zone Blog features an editorial discussing some disturbing similarities between BioShock and RoboCop. While he's just joking, it does stack surprisingly well for this game, already accused of being a weak rehash of SS2 with a setting ripped from Fallout, a more interesting but underlit topic of consideration.
BioShock deals with the social ramifications of building an underwater, elitist meritocracy, an anti-welfare state which becomes poisoned by the ubiquitous concepts of consumerism and capitalism. This leads to widespread rioting and the eventual destruction of the city of Rapture. RoboCop is about a robot policeman in a futuristic dystopia, in which rampant capitalism has led to the privatisation of state law enforcement, and robots everywhere. This leads to widespread rioting and the eventual destruction of at least one television shop in Detroit.
See? BioShock and RoboCop are rife with overlapping themes, and both star a main character born of the ills of their respective societies. RIGHT, NOW LET'S GET SPECIFIC.