I’ve never encountered a negative review in a magazine (I subscribe to Stereophile), but I have encountered them on YouTube, and they really get my attention when I do. Negative reviews are risky for the reviewer, not just getting sued from the manufacturer or losing out on the chance to review gear from other manufacturers; but also from the viewership side, I don’t think negative reviews are popular anyway. Negative reviews often tell more about the reviewer than the product. Some reviewers refuse, or choose, not to offer negative reviews, period.
Stepping back a bit, I consider the inclusion of comparison to similar products in a review as an effort to contribute some ‘objectivity’ to the review; I also look for key words like, ‘I liked thus and so’, or, ‘in my system xxx worked better’, etc., or even, ‘I heard thus and so’ as phrases tipping me off that what follows is a subjective ‘take’ on the product or its performance. I like to hear components revealed and discussed as another objective component of a review, as in what kind of transformer is used, how big, how many, etc, overall system design (delta sigma or resistor ladder), or particular design elements, like the use of capacitors in the signal path (or their removal), how one designer, or one manufacturer, employs a particular design element.
Basically, I evaluate a review, or reviewer, by how much, or how little, he or she answers the questions I have about the product under review. Some hit the mark pretty well, others miss it entirely. Test measurements are supposed to be objective data. But I think, on average, most reviewers, and most publications, understand their task to be reporting both objective facts and subjective opinions on what it is like to own and use a product. If they don’t at least try to do so, they don’t deserve my subscription.