Just read this great blog post on Linkedin.
One example is
Bell Curve Performance Reviews
Performance reviews in general are a bureaucratic waste of time, but the ones that force managers to fit their teammates into pre-set slots on a Bell Curve are disgusting and unworthy of the brilliant people on your staff.
If you truly don't trust your managers to hire wonderful employees, why did you make them managers? Bell curve performance reviews only encourage the hiring and retention of so-so employees, or worse. Get rid of them in 2015 and celebrate your team's briliiance!