Who publishes commentary papers, and how?
I'm not from your area of research so my answer might be invalid, but in my field it happens that you are asked to list "original papers" and "derived papers" in different sections of your CV. So when you are applying, e.g. for a professorship, the original papers are the ones which are taken into account more heavily than the others. 

Especially earlier in your career you should focus on your own scientific work. This qualifies you to write good commentaries, later ;-).