In audio it can be quite difficult to find what you're looking for. Reviews of course may suffer from a whole host of faults. Multiple reviews of a product are really necessary. One thing that seems to affect audio is becoming tuned in enough to a headphone or to lesser extent amplifiers or DAC/s. Initially you don't hear them at their best. So if the reviewer is tuned to another headphone and then writes a review of a new headphone he aquires, unless he gives time to transition to the new item his review will probably be inaccurate in many aspects. The quality of the reviewers hearing is also critical. His or her ability to describe what they hear is also a major factor. This is where things can become really confusing. There are many elements in audio like the attack, sustain, speed (decay), soundstage and imaging, frequency response, tonality, timbre, colouration, euphonic distortion etc. These are usually unique for every headphone. To accurately measure and compare these values for every headphone would be a huge amount of work. So the chances are a purchaser won't know what these values are for a purchase made or how they relate to existing equipment or what the initial impression will be before transitioning to the new equipment. Because there are so many variations/variables when someone finally settles down to a headphone they may end up disappointed and want something different.