Mesa 21 is a dope spot, the food is consistent and pretty comparable price-wise. I ate here twice last week (busy day and slow day) and I wasn't disappointed for the most part. The burger I got was perfect both times and the fries were good. However, I did not like the pizza. I got the buffalo chicken pizza and it lacked any sort of flavor. The quality of the ingredients was good but the pizza lacked sauce and the dough was bland. While I didn't enjoy the pizza on either occasion, the burger was consistently a 5/5 on both days. Overall I think the pizza just needs some extra flavor, maybe add some garlic butter to the crust or some different seasonings when making the dough.
