Comment by pbnjeh
One year was insightful, when in a meeting we watched our management rewrite their own performance plans on the fly to pass them. They even threw in the minor only partial success or two, so that the results didn't look too perfect.
Another time, at another job, while we had hiring and expense freezes, my manager walked up to my cube with a 12% raise -- out of the blue. Because my previous management had screwed me (causing me to accept his internal hire offer) and I was "doing the job" he'd hired me for.
Performance reviews, of themselves, are bullsh-t and serve primarily to generate a record that your management and HR can use to accomplish and "legitimize" whatever they want.
Once you know this, and if you're still in a position subject to them, it feels like a hostage situation. Any information you provide to them is subject to use against you or someone you care about (and/or just in violation of your own ethics -- "s/he's not my friend, but this just isn't right" -- if you have them).
Mr. 12% and I learned, through experience, to trust each other. No management process is going to replace that.
P.S. And, in my experience, if you don't "provide them enough ammunition", they will actively "guide" you in rewriting it until you do, refusing to accept otherwise. They are not really soliciting your feedback. They are soliciting your tacit endorsement of what they are hoping to accomplish -- regardless of how and whether that aligns with their and the business's public statements and objectives -- internal and external).
Sorry, my language went a bit into the weeds, there. Stated shortly, I've had managers insist I write what they want, contrary to my own actual opinions and feedback. The process was entirely rigged. Glad I don't work for them, anymore.