There is no such thing as 'underpar work' in school. There is just work in progress. When is anything really done? When we drop it or "finish" it and go on to something else.
For example Picasso said he never finished a work - when he did - it was dead. He always found a place to stop which perhaps nothing could be added or removed but he believed his work was always in progress, as a practicing fine artist.
In a student as weaknesses are identified one should educate and bring up to the standard, but one should not just rate the work 'underpar' - its an emotional chokehold, from a judgemental framework. Modern individuals, students and teachers, working with each other have innovated beyond it.
When working together or participating together with other people you don't turn to another person and say "This is underpar work" you work on it together until it is improved. Where did academia get the punitive idea that that was ok, and a standard to uphold?
It's an underpar way to communicate effectively, and it needs to change in my view of what educators may offer, working interactively with students to deliver motivation, and information.