Designer ranking his own scenarios?

[Shad]

My freshman year of college I had to take an English class. In that class the professor required us to grade our own essays with comments before turning them in. My final essay for the term I clearly remember grading myself a B. My reasoning at the time being that while I believed my thesis was sound, I was not able to fully support it with textual references and literary evidence. To me this is perfectly reasonable, especially when one considers that what was "a good idea" in 2008 may no longer - with the benefit of hindsight - be a good idea in 2012.

Do you people who object to designer self-ratings have performance reviews in your workplace that require personal performance ratings? What do you do? Fill in N/A on every blank?!?