What you don't seem to understand. Reviews and impressions are all subjective and just your opinion on things. What if I were to say I hear the opposite of what you do. Then tell you those are my objective findings. They're not. They would be my subjective views just as yours are subjective.
Ack. I wasn't going to reply, but this is too much.
Have you ever read a scientific journal article? Let me start you off slowly:
A study is designed by holding some things constant, while introducing variables. The next step is to record the results as they present themselves. The last step is the interpretation/conclusion, where the results are explained, and data can then be fit to a model.
My review follows this same pattern in the sense that my constants are the HE-500 and HD600. The variables are the songs I chose. The interpretation/conclusion was the fact that I chose a winner based on the evidence gleaned from the experiment, and my personal tastes/experience.
Graphs are not the only qualifier for an objective set of impressions.
This is a subjective review: http://www.head-fi.org/t/657098/quick-review-of-hifi-man-he-400
Mine is not.