I think it's really funny that many people here talk about how the Mexican food at the San Angel Inn is not what we're used to in the USA. Many people say that it's not the "Tex-Mex" that the USA is used to. I'm curious to know the locations of the people for whom "Tex-Mex" is more common than regular Mexican food. I lived in California for 20 years before moving to New Jersey and both places definitely know the difference between "Tex-Mex" and authentic Mexican food. Is it safe to say that most people who automatically think "Tex-Mex" when thinking of Mexican food are from the Midland?
To the OP: please excuse my tangent. To answer your question, I think that the cuisine at the San Angel Inn is more than passable. I quite enjoyed my lunch there. I believe I had the Pollo con Rajas and my boyfriend had the Enchiladas Verde, and we each loved both dishes.
The reason I said it is because I've heard complaints both at WDW and here at home that the food was not the kind of Mexican food they're used to having,ex-burritos,tacos, chimichangas,etc. From the accents, I'd say it's more widespread than just the midlands.