This is my husband's favorite Charlotte-area Mexican place and the only one we go to now. (He's from El Paso and picky about his Mexican food.) La Unica is one of the few places around here that we found that has menudo -- not a plus especially for me, but hey, I'm not from Texas.
There is always a crowd and the staff are very good at seating people quickly and are patient with kids. I tend to get burritos and they are quite good here,
as are the dishes that are not so utilitarian.