What's the alternative? If there were some objective measure of performance then this would be an easy problem to solve, but that's not the world we live in.

What's the alternative? If there were some objective measure of performance then this would be an easy problem to solve, but that's not the world we live in. When you've got 100K employees, trying to come up with a consistent scheme seems to be a reasonable goal, but tricky to implement. Also, I've seen complaints about fairness with regards to every evaluation scheme I'm aware of.