Roberto's is far from my favorite Mexican restaurant, but it does the job. Their rolled tacos are not bad, and their carne asada burrito is okay.
I'm not too fond of the quality of the carne nor the seasoning. However, I realized they have decent lunch special combos. I got the carne asada taco plate for lunch, which came with a drink, and was sufficiently stuffed for $5. I call that a decent fast food deal.