You will have to kill me, but honestly.. I only went to the quick food at Mexico's pavilion because my mother insisted.
I did not enter the Mexican Pavilion itself...but we tried the food.
The food was ok, but most there appeared to be in texmex style and northern Mexico (border) than real Mexican.
For example: the type of tortillas used there are not the usual mexican tortillas you get here in Mexico.
The ones used in the pavilion looks like those "prepackaged" and "produced in mass" tortillas that are made in factories.)
Having freshly made tortillas is a huge deal. It adds a lot of flavor and texture to the food.
(to resume and be clear.. I have no idea about the Mexican Pavilion, because I did not enter.. but I'm 100% sure that Donald M&H does not fit there, as he is an american Icon.. not a Mexican one. Id rather love to see Panchito Pistolas, just like I would have loved to see the Brazil Pavilion with José Carioca)