Where are you from and what do you consider good Mexican? If you're from anywhere near the border or an area with a high population of Mexican immigrants your idea will be VERY different from someone who is from, say, Maine or the Midwest. We had great Southwest/Tex Mex/ Mexican food in Southern California, Arizona and New Mexico. We found good Mexican in parts of the Atlanta suburbs. I haven't found anything worth recommending in VA at all yet. (Been here 8 years)
That said- my family does enjoy Chevy's Fresh Mex just outside of downtown Disney. I wouldn't call it authentic or amazing, but we really really like their fire roasted salsa. The rest is just "very good".