While it is generally accepted to write papers using the collective we, what is a common practice for writing peer-reviews: I, this reviewer, or something else?
For example,
This reviewer has a minor concern with how pink elephants are defined in this paper. It would have been helpful if authors defined an elephant first, and then added the color pink.
I have a minor concern with how pink elephants are described in this paper. My recommendation is to define an elephant first, and then add the color pink.