A friend and I tried to get into Mi Tierra at 7:00 on a Saturday night but opted for the slightly less busy La Margarita instead. Our table wait--which we were told would be 35 minutes--was about an hour, but the Pomegranite margaritas and people watching made up for it. The chips were hot and the salsa was authentic (soooo good). Our fajitas were yummy, although they only come with pico, guac, rice & charro beans, and some sour cream would have been a welcome addition. The only negative was the slow service, and I can't exactly fault the waitstaff. This is a tourist location and, in our section alone, we saw a softball team, business people in town for a conference, and a ton of vacationers with cameras and fanny packs. If you're in a rush or highly impatient, go somewhere else (out of El Mercado), if you like to people watch and kick back in a festive environment, try La Margarita.
Pros: Fun atmosphere, great patio, great food
Cons: Pay for parking ($2.50 for 2 hours), long table wait, slow service