What makes a good fansplat?

I was recently reading through a great deal of fanmade supernatural splats, and I recently began toying with the idea of making my own with some friends I know who are also interested in the rpg writing and the WoD games.

As such, what, to you, makes a good fansplat for WoD? For example, what major components does it incorporate-- or not incorporate? Does it cover a good idea for a supernatural archetype (ie Genius)?

For a start in terms of my own work, as I see it, the average fansplat--and gameline in general-- has the basic elements of the Story, the Theming, the Archetypes, the Organizations, the Threat, the Powers, and the Fuel:

(By all means, please tell me if this is inaccurate or deeply wrong.)

-the Story of Changeling is the tale of how beings tied closely to change and imagination and wonder deal with a world becoming inimical to their existence

-the Theming of Vampire is battling one's hunger and retaining one's humanity-- or not-- in the face of becoming a monster

-the Archetypes of Demon are all of the different demon types

-the Organizations of Wraith are the Hierarchy, Heretics, and Renegades

-the Threat of Werewolf is the Wyrm and its machinations

-the Powers of Mage are the manifold spheres of magic

-the Fuel is the in world meta-currency that makes all of the Powers work (from Pathos to Quintessence and everything in between).

Beyond this however, knowing the things that make all these components and the fansplat overall good would really be great.

All of your insights will be met with great thanks!