I swung by Nala's again for dinner tonight, and for the first time I started to understand why some posters may not be fully enthusiastic.
For the first time, my burrito was made by someone other than Nala. The ingredients were of the same quality as before, but the assembly was not--the tortilla was not as thoroughly toasted/warmed, the lettuce occupied more space in the burrito, and the whole affair was lashed with Vietnamese chile sauce (!), something that completely changed the taste from what I had before.
I still respect this place for the quality ingredients, reasonable prices, and friendly service, but it's also clear that there are some quality control issues when different people are preparing the food. I hope this can get straightened out!