In this review I am going to do a lot of comparison to another taco joint also on Madison, Barrio. Both are excellent places to eat; they are just different- and depending on your mood, one will be a better fit than the other....
Taco Tanto is a much smaller restaurant, so may need to wait longer to grab a seat, but is brighter and perhaps a bit cheerier in atmosphere than Barrio. Their tacos are larger in proportion, but also a little bit pricier than Barrio. Taco Tanto has a small bar, but the selection is well thought out.
Taco Tanto has a more extensive but set menu than Barrio, but allow people to customize whats on the menu so its almost as versitle. I have had the beef tacos, chicken tacos, black bean tacos, and chips & guac.... and I ca't wait to try out more of their menu!