I've been to Dos Tacos several times for lunch, but I try to go only when I'm craving mexican food, because the food is just average and the service is a bit slow. As there are not many more international options around my workplace, I end up "having to" go there.
I've tried their burritos, chimichangas and nachos. One time I went with 4 colleagues and sat down around 11:50. After we ordered, a big table came in and ordered. We saw how they served all the plates on the other table but none to us, so we complained. Seems like they had messed up and lost our paper somewhere, as there was a lot of movement between the waiters when they realized they had made a mistake with us. At the end, instead of giving us a discount, they opted to give us a business card with some hand writting from the rsponsible of the shop giving us free nachos for the next visit.
My Korean colleagues decided to not come back for a next visit because we had waited for at least 45minutes to get any food, even after attracting their attention and asking about our meal whereabouts.
I did come back again, and brought the card. Ofc, they were really hesitant and I had to insist a lot that it was real and was given to us due to super poor service from a previous time. That got me quite mad because not only i went through a bad exp.last time, but also this time you are wasting my time and my face (in front of the other friends that came that time) by doubting about whether the card was real or fake!