Great Question! While I can understand that this is a frustrating issue and can be taken as a personal attack I would ask that you look at this from another perspective.
The CSM is charged with upholding the integrity of the evaluation process for NCOs. Therefore AR 623-3 and DA PAM 623-3 provides him/her the ability to review the reports. Now typically the goal of the CSM is to identify issues in which the standards:
1. Are not upheld. Meaning the comments do not support the rating. For example let’s say a Soldier receives a MET STANDARD and the bullet comments actually support an EXCELLENCE rating. Or the comments show a MET STANDARDS but the comments reflect a DID NOT MEET STANDARDS
2. The report contains an inaccurate information such as: inaccurate counseling dates, incorrect administrative information, etc.