Depth? Depth of game rues directly related only to scoring or, the depth of the overall availability of a path that changes the game in real time.
Thus far, at the top of this scale for the later would be Wizard of Oz.
I don't think you realize the breadth of certain games. Depth does not only equate specifically to rules. What about "width". I would suggest the above example of WOZ is the widest and deepest of pinball games, thus far.