If performance reviews were that useful, why are they done only once a year? I feel like this should be a weekly conversation. Employee growth needs constant attention, but unfortunately it only happens for a handful of hours once a year.
My attitude is more pessimistic. I feel like these reviews are only useful for HR, so that they have a paper trail in place in the event that an employee needs to be terminated.
Edit: Just so my intentions are clear, I'm a cofounder of ididwork