Unless the employer is actually going to invest in the employee who performs well, and is prepared to mentor them, then its a complete waste of time and effort.
If a performance system is a way of getting rid of underperforming staff, then all that happens is that it becomes a matter of dread, and leads to lots of employment relations problems, and then I step in as the Union rep to discover that the system was not operated correctly.
When commercial management consultants come into an organisation for a fee, they have to justify the outlay - so they will change or introduce some form of appraisal system - they will never ever tell an organisation that everything is fine and need no changes.
Typical things that go wrong.
Unrealistic targets
Targets outside the scope of the employees work/grade
Too many targets
Trivial or inappropriate targets
Targets with no realistic application or relation to the work
Little or no input from the employee, or input from employee is pretty much ignored
Lack of periodic reviews to discuss progress
Managers untrained, not experienced.
Managers who are overworked, going through the motions
Over rewarding
Under rewarding
Differently rewarding - such as higher levels of staff can gain promotions, yet others on lower grades merely get marked as competent
Time scales wrong
Attempting to force a perfectly motivated and competent employee to jump through hoops because of company philosophy, which in turn is extremely patronising.
Not all staff want to be thrusting and developing, they just want to do their work, get their pay and go home, they do a regular days work and believe that is enough, and most of the time it is enough.
Treating staff differently - favouritism
Using the process to deal with disciplinary/behavioural/ attendance issues- these should always be dealt with as they arise and not many months afterwards in a skewed appraisal system objective.
Not taking into account different circumstances - one branch might find achieving certain targets easy, and another branch may find that the same targets are almost impossible - this happens a lot in education where students from some areas do far better than those from others.
Lack of proper oversight, managers will almost always back each other up, no matter how poor the appraisal targets and appraisal operation.
Lack of credibility, no-one believes in it, lets face it, if managers are not properly appraised then why would employees have any faith in it?
Staff appraisal tends to be bureaucratic and a poor substitute for a manager being able to spot talent, develop it, and identify problem staff and take appropriate action.
Its a poor substitute, and its just a form of de-skilling managers, it means you can recruit less able managers for less money. Good managers, are expensive, so are good employees, yet these are exactly the ones that any organisation need to retain - problem is - this does not immediately look good on the balance sheet.