NCOER. Are they an accurate way to evaluate NCOs?

I have been in the Army for 9 years and ever since I got my first NCOER I have always wondered if they are a good way to conduct an evaluation report. Now that I have had to write them for my NCOs, I feel like there could be a better way to write this evaluations. As I was writing the narrative for a BSM and explaining the reason why this individual should receive one, i thought that if NCOERs were written in the same format, they would more accuratelty reflect what the NCO did during his/her rating period. I understand that it would take more than just a narrative to write an evaluation report, but overall if the main portion was done in the same format as the BSM narrative instead of short bullets, I think that you would write a more accurate report of the NCO's performance and potential.

What are your thought on the way NCOERs and how could we make them better?