I've tried this location three times now so I believe I can give an accurate assessment. If it's too crowded, there is a good chance you will not be happy with the service or cleanliness. If it's not crowded, both the friendliness and accuracy of your order improve and there is a clean table available to use.
The food is good. The meat is bland if you choose a beef taco, but flavorful if you choose a quesadilla with pork. So if you choose well, you will get a good meal. The salsas all help bam up the flavor too and I suggest making a trip to the salsa bar before eating your food.
There is a need for consistency at this location. Many people visit once,compare it to the established one in Mesa and then do not return. My last visit was my best visit, so I suggest giving them another try if you went a while ago.