Does Buddhism claim perfection? Does it claim to perfectly describe the nature of this world and all of mankind without contradiction as other religions do?

I read this article: http://approachingaro.org/certainty .

The author says: 


  Buddhism is unique, as far as I know, in insisting that the kind of answers we want cannot be had, anywhere. Emptiness—inherent uncertainty—is at the heart of Buddhism. For this reason, Buddhism is sometimes described as “The Way of Disappointment.” If we follow it sincerely, Buddhism repeatedly crushes our hope that somehow it will satisfy our longing for answers; for ground we can build on; for reliable order.


I know this may just be an opinion. If this is true, it seems contradictory to me. It's in and of itself a claim of certainty that we, as human beings, can never attain certainty.
That's a ridiculous statement.  How could you follow something sincerely that wasn't built on solid ground?  If the dharma wasn't certain, pursuing it would be a complete waste of time.  While it might not answer larger, existential questions like "why are we here", it is a fairly reliable point of departure.  

Uncertainty is, however, a very important part of practice.  In fact, doubt and frustration are one of the most salient features of the path.  Buddhism doesn't seek to give answers.  Instead it asks us to reevaluate our assumptions.  It's very aim is to disrupt the order we've conjured around ourselves. 

I wouldn't go so far as to say that Buddhism tries to perfectly describe the nature of the world.  The very act of describing it inevitably reduces it to ideas and descriptions.  What Buddhism does attempt to do is give us an opportunity to see the nature of the world perfectly.