Feedback that praises or compliments someone on something done well is normally known as positive feedback ("Negative feedback can also help improve service" by Mr Jeffrey Law Lee Beng; last Friday).
However, if that feedback actually puts that person on cloud nine and he does nothing to further improve his service, that can be negative feedback.
It would be worse if he does not share the process to achieve it with his colleagues.
Similarly, feedback that highlights a shoddy piece of work done is normally known as negative feedback.
However, it can be positive feedback if it motivates the person concerned into improving, so that he does better the next time.
In other words, feedback is neutral. Whether it is positive or negative depends on what the recipient does with it and how his supervisor evaluates him on what he has done with that feedback.
Steven Lee Thien Poh