The annual performance review process isn't really a beloved business tradition. In general, employees hate them. And I think that feeling stems from the inherent presence of criticism in the review process. No one likes hearing that they didn't do a good job.
Now I would love to type inspiring messages fit for desk calendars everywhere about how you're faults can become your strengths, teaching everyone to turn those negatives into positives and those frowns upside down. It would be a lot easier to say, "Don't get emotional," or "Try not to sound defensive," and call it a day. As if those were two super-easy steps that no one should have a problem with.