Quote by Jeffrey Pfeffer

Managers don't like giving appraisals, and employees don't like getting them. Perhaps they're not liked because both parties suspect what the evidence has proved for decades: Traditional performance appraisals don't work.
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The most basic problem is that performance appraisals often don't accurately assess performance.
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Possibly the biggest issue, however, is that performance appraisals focus managers' attention on precisely the wrong thing: individual people. As W. Edwards Deming, the father of the quality movement, taught a long time ago, company performance often results more from variations in systems than from the individuals doing the work.

Source

Online: The Trouble with Performance Reviews