Jarvis Deberry has an interesting op ed in the July 3rd Times Picayune. It seems that despite there being more than a few marginal employees working for the City of New Orleans, only 31 of the 4,315 city employees evaluated in 2010 were found to "need improvement." I'm not kidding, 31! And just one received an "unsatisfactory."
I'm not a big fan of employee performance evaluations. I think most employers do a lousy job of the evaluation process. I also think its implausible to believe that a supervisor is going to give a frank evaluation of an employee he/she does not yet want to fire. As long as a supervisor's department or job is dependent on the performance of subordinates, there is an inherent conflict in the evaluation process that plays against fair evaluations. And no, I don't mean unfavorably towards the employee. Only after a supervisor has made a decision to "get rid" of a subordinate can you expect a full accounting of job deficiencies, and sometimes not even then.