staff evaluation

we have been given an evaluation form last 3 three weeks and nobody fill up the form until the boss called one by one..we are suppposed to rate ourself, evaluate our contribution, productivity,creativity..whatever..we are judge by the way we delegate our job, dealing with client and authority, diligent, precise,punctual and make less mistake..sometimes its hard to judge one's capability in a short period and from one job or project. architecture is a subjective field, there are many factors contributing to our performance, sometimes we have an interesting project but from not so strong client, who only depends on bank loan. its quite frustating when all our effort, not 2 or 3 months but a year has been wasted due to financial capability. therefore its fair enough not look only at the outcome but also the process.
i was called last two days and it was almost an hour 'evaluation session', the boss told me that all of us rate ourself too high..what do u expect? if we rate our self below 6/10 it looks like we have low self esteem, or not confident enough..well boss always think that they are right, no matter what. anyway i had express what i feel about that office and what i expect from him and the office and at the same time i will improve myself, 'be more thoughtfull'...hmmm