Visiting from another state, so I have never had Del Taco before. The service was typical fast food, at or slightly below McDonald's take on service. Restaurant was very clean. This rating is basically off of food quality. First I do not understand why you would put taco and fries together and call it a combo, that's weird. Second, the taco quality is lower than taco bell.
Basically avoid unless you are drunk and looking for a burrito at 3 am.