While I hate to admit it, I eat Qdoba a few times a month. It's as close to fast-food as I get. It has become a Sunday evening staple.
This downtown spot is a great location, but can be hit or miss on the service inside. Sometimes the food is fresh and everything looks great... sometimes it's the opposite. But with no Chipotle or any other competition downtown, this is my staple Mexican to-go.
The naked pork burrito has been my favorite for years, plus it's only 600 calories and 8g of fat, which is hard to do at a place like this (don't even look up the nutrition facts of their queso!). They marinate their pork in green chiles and a multitude of other spices, it is pretty darn good.
All-in-all this is a good spot for inexpensive, fresh 'fast-food' Mexican.