Their interpretation of Latin American fast food is not bad at all. They're serving plebs however, and for the most part, Tex-Mex-esque food sells best. For the price, though, the portions could be better. I understand that they need to pay for overhead and the million staff members, but honestly the portions are tiny and largely unsatisfying. Bring a 20 if you plan on leaving with a full stomach.
The fact is, a lot of wannabe hipsters come to this joint and get a little rowdy- they love it, but they really don't know any better. I'm sure the majority of patrons could be tricked into paying 3 times as much for Taco Bell if I repackaged it. If you're hispanic or a fan of genuine Latin American cuisine, the menu might not be your cup of tea. Holler at the dude at the front, and ask him to make you something else, and he'll probably oblige.