This is authentic, but LA style. Feels like being back in California, all the ingredients are pretty fresh, and the salsas are fantastic. Especially recommended is the poblano burrito ($7.25, below), an interesting (if messy) mole-lover's delight.
It's a very casual place, I tend to stay in the self-seating portion near the burrito counter on the right. After selecting your burrito, grab a well-priced bottled beer and sit for as long as you like at one of the tables.