It can so clearly be quantified that it is difficult to prove, but you do show how you are confused. A "top 10" list is clearly not going to work in terms of absolute measure.
Does this mechanic do what they claim it will? Does the game foster the genre it represents? All quantifiable.
If you would like to learn more, go to the gameology board and ask any specific questions you may have.
A top X list will not work? That much was obvious, since that was why I used it: an easy reference to show how there will always be lack of absolute consensus, even among the respected, which casts significant doubt on the claim that a game ruleset's value as a whole can be quantified.
Does this mechanic do what they say it will? Quantifiable, as long as "what they say it will" is in reference to relative speed, a measure of probability, or something else which can be measured. Does this game foster the genre it represents? Maybe quantifiable. How do you handle the inevitable disagreements? People react in different ways emotionally to the same things. Because it invokes a feel for a large set of the population, does that make it absolutely the case?
D&D 3.x's rules as a whole foster a feel of a tactical wargame to me, not a high fantasy action-adventure. I am reminded more of firing artillery across a distance in a battle that is clearly either easy or lethal than clashing sword and spell in a life-or-death encounter. Things take too long and there's too much discussion, not enough kick-in-the-door. Has D&D 3.x, then, failed? Or is my response to its feel irrelevant? Is there, perhaps, some objective measure to determine how one's subjectively described mood should be? Did you have something else in mind entirely when you said "foster a genre"? That's plausible. If I am confused, it is only because you are brief yet unclear to someone who does not know your usual subjects of discussion and demeanors.
Parts of something being quantifiable, sure, something as a whole? Well, you're going to have to drag out every part of it (or nearly) to convince someone of that.
Now, explain to us how WoD fails to do these things. You brought 'gameology' into this discussion of WoD, so use gameology to finish it.