Creating feedback that is truly useful requires more care and attention than is typically invested.

Like any skill — chess, golf, learning Mandarin — offering strategic developmental feedback requires that we pay attention to and do many things effectively and simultaneously.

Given the opportunity to help others develop and become more effective, it’s worth the effort.

Source - Read More at: hbr.org

I have always felt that managers needed to accomplish  3 distinct things in order to be an effective manager.

1) Making sure that your team has the tools they need to be successful.

2) Learning the numbers for your specific sales, and then holding your team accountable to those metric.

3) Being able to effectively coach and mentor your team. 

Being comfortable and proficient in providing constructive criticism, and being able to coach for success, is a critical skill to have, and all managers should invest the time needed  to become skilled at providing strategic developmental feedback.