I wonder if anyone has any experience in flat out refusing to participate in this sort of thing. I did it once, but was already on my way out the door/in my two week notice period and HR would ask me once a day, every day for almost two weeks to write a review before I left.

I say "almost two weeks" because I finally told the HR person that I would be talking to the local workforce commission if they came to my desk one more time and asked me to write a review.