What is it about authentic Mexican Food that gives it its flare?

I'm Mexican and don't really notice, but I've always wondered what gives Mexican foods and drinks its..shall I say edge? Is it the spices and herbs? Fresh products? And I am talking about GENUINE, AUTHENTIC Mexican food, not some crappy Del Taco or Taco Bell.

What is your best Mexican dish recipe?

I'm talking authentic Mexican food-Not the Tex-Mex crud.

Would a quality quick-service mexican restaurant (fast food style) do well in a college town?

I'm not talking about Taco Bell, but rather starting my own. It would have the same quality food as a sit-down, but served on plastic plates and to-go boxes instead of normal plates. I'm talking authentic mexican food at a lower price, but with the same high quality and made much faster.

where can I learn to cook authentic Mexican food?

would like to learn how to cook & prepare authentic mexican food!!
With the exception of silverbir..... thank you for all of your great answers!!