A Wonderful World
It's easy to get lost in Rapture. Not physically, mind you -- your objectives are pretty clear and you have an excellent map. It's that the world Levine and his Irrational (now 2K Boston) team created is so credible and convincing, it sells the entire experience. By themselves, the solid gunplay, unique plot, and morality-based decisions already make for an excellent game. But it's all of that, plus everything else. The sounds of the vending machines, the demented rants of a housewife who has long lost her sanity, the ability to craft your own ammunition, the level design based on some beloved touchstones of horror (medical experimentation, a garden of evil, the performing arts), the optional photography research, the color palette, the scratchy rendition of "Beyond the Sea," the fire and lighting and water effects...everything is in its right place. Preserving the illusion allows the player to become an active participant, and that is what gives power to the choices you make during the game.