I tried Senor Burrito for the first time 2 months ago. I ordered a pulled pork burrito with veggies, beans, rice, sour cream, and guacamole and chipotle salsa. It was mediocre. I thought they could have been more generous with the fillings, because my burrito looked so flat! It was also *extremely* oily (as in, oil/sauce was literally dripping/spilling out of my burrito as I ate it, and it was SO messy). I'm not sure why, though - either the chipotle salsa or the pulled pork, I suppose?
Service-wise, the employees were friendly enough, but the lady making my burrito could honestly have been a bit faster! She took forever to prepare my order.
Overall, I was quite disappointed with my burrito (especially since Mexican food is rather hard to come by in Singapore). Wouldn't revisit.