This article states very good points about how you need to know a few things before revising a paper, you must know what the writer is intending to do in the paper and the audience that they are writing it for, what the writer wants from a reader at this stage, and to read the entire draft before commenting on it. A lot of the time people just want to start editing ones paper without knowing these points and these points are very valuable information to know. I also agree that you should not argue with the author this is their paper not yours it is your job to help them better their paper not tell them something in it is wrong.