We judge the quality of music works and performances by averting our attention to the sounds instruments make. The dramatic facial expressions actors/actresses portray on their face. The technique musicians use while playing their instrument. The way the costumes are designed in a performance. If the guest speaker in a performance stuttered or forgot a pat of their speech. If a composer’s sheet music dropped in the middle of composing a recital/performance/play. To sum it up, we pay attention to the little details in the things we see/witness, which makes us quick to judge.
Hope that helps!