Salazar Bros is a full step up from ubiquitous "__bertos" option both in Tempe and throughout the valley. The only downside is that they are not open all night. Their carnitas and carne asada are both excellent, and the guac is not the green slime you commonly find at the aforementioned competition. Haven't yet gotten too creative, so I have no opinion on their mariscos or other more adventurous Mexican offerings.
Also, they are really nice there and always make you feel taken care of. 4 stars in the overall grand scheme of eateries, but for what it is I feel comfortable saying it's 5 star Mexican fast food. Please support these guys and keep them in the neighborhood!