As Dublin stated, "quality" as in quality of construction, is in the sales comparison grid. Also, in following the form's directions, an appraiser is supposed to "describe the neighborhood" which is a detailed analysis of the area being appraised. This includes the "quality" of the types of properties that are located within the subject's neighborhood.
The neighborhood description is important for the client to understand the context in which the property is located and for selecting comparable properties.
It's amazing how many appraisers just slap boilerplate in this section. It changes from location to location.
Also, I never use average sales prices of the area. I always use median sales prices. But that's just me....