As someone who has spent a bit of time working professionally with art and artists, it's important not to underestimate the value of raw sentiment.

The average joe can usually identify that something is wrong or feels off, but may not be equipped to express exactly what is wrong or how to fix it. This doesn't mean their sentiment is useless or invalid; It helps guide professionals, who are equipped with the skillset to understand and solve the problem, to the places in a work that need their attention.