Concept: “Mork Borg can be overwhelmingly nasty. Why not balance that with some beauty? And also add even more misery.”  
Content: New rules, eight classes, and an afterlife-spanning adventure. Also sports.
Writing: A meditation on duality. With a serious tone contained within all its dubious fragrance.
Art/design: A highly interactive and reversible design with upright and inverted text interleaved beautifully.
Usability: Designed for print. Flip the book. My condolences to page 5.