* cult sex scenes
* a forced-participation theater that humiliates you using Occulus Rift-technology
* the Kill Bill-esque ending
* ... and, most of all, the idea of continous education using an immersive Minecraft-like book/world that expands in complexity as your education grows.
Too bad we (the hackers) never completed even a crude version of the Primer (the book in the last bullet point) for the young geeks out there.