When you are appraised, you should agree with the judgement ( pretty much anyway) if you don't the process is broken, because there's 'nothing' to improve.
It's possible the appraisee is a complete c**t and not rare for the appraiser to be one as well. Even both if they don't get on.
I've been marked down once or twice (would you believe for lack of tact !!) . I've been marked down when I most definitely disagreed, and I made use of the feedback box.
Boss was not happy, I told the f'ker join the club. I agree that after a serious breakdown you might as well buff up the resume, but I seee nothing wrong with delivering a couple of kidney punches on the way out.
I've been through many flavours of appraisal, never yet seen one that was truly honest but, if how effective the thing is isn't being measured, it isn't appraisal.
No that's a form to fill out so you can lick the boss' ass and hope you do it well enough to get a pay rise.