I agree on this. Yet, it doesn't change the final results: measurements, if done properly and methodically, are measurements. The fact that manufacturers sent the product to you or not should not change the final data (expect for risks of cherry picked samples, for sure
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I don't think Amir & Archimago are comparable with subjectivists reviewers your are mentioning. That, at least for one reason: With subjective reviews, you are free to say whatever the heck you want about the product's performance, not with objective reviews. Plus, neither Amir, Archimago, nor Erin offer advertising services to companies. A. Robinson, Darko and S. Guttenberg certainly do. Needless to say, 95% of their reviews are always positive anyway. How is that helpful to make a purchase? I don't know.