I think it's fair that employees are given regular feedback throughout the year, instead of it be withheld until evaluation time and not have opportunities to c

I think it's fair that employees are given regular feedback throughout the year, instead of it be withheld until evaluation time and not have opportunities to correct. I think it's also fair that the feedback mechanism is bi-directional. However, what concerns me about this is, managers with lower-performing employees may get dinged harsher than managers with top performers. In large companies with many teams, this will require a bit of digging to uncover this factor. What is manager's recourse without looking like he or she is throwing his/her team members under the bus?