I have to say though, this whole discussion is a fascinating insight into what appears to be the thought process of many managers and/or founders.
* Your perception of your employees' performance is consistent and predictable over time. Not all bosses evaluate based on consistent and predictable criteria.
* Your perception isn't significantly distorted by false beliefs about who has done (or not done) what.
(Needless to say, that's generic 'you', not you specifically.)
If you want, you can say "I hereby define 'good performance' to be any performance that I, the boss, think is good" – but that's just a semantic game.
"I hereby define 'good performance' to be any performance that I, the boss, think is good"
At its most basic level, that's _exactly_ what we as leadership do. All you're now saying is "some bosses suck." Well... yes, news at 11.