To echo another reviewer's comments, the staff at Senor Burrito is excellent, the owner is a sweetheart and her husband is a very friendly.
Taco Tuesday is one of my favorite days of the week. The $1 tacos allow you an endless option of toppings and for $2 you have a quality meal. I highly recommend the carnitas, which is the pulled pork, but only if there is an adequate amount of it. I find that as the supply dwindles the fatty pieces get more proportionate.
There are specials every day, including $1 taco happy hour, that range from nachos to burritos to other fine dishes. While the bring uproar is usually over the tacos on Tuesday, the nachos are super filling and awesome for $5 on Wednesday.
Sadly places like this in Maryville do not last that long, so please enjoy this and help continue its existence.