I think constant scale would be quite tricky. IMO it's clearer if it's done based on price range.
I think seperate value/price category is not a bad thing. I think most reviewers think the value is combination of sound, accessories, build etc. Infact it might make sense to replace the value with total score?
I think I can explain this. Bass on Phoenix is neutral relative to low midrange. Here is a measurements I made. So the bass does not bump up from low mids which might explain why the reviewer felt it was light(ish) on bass. Sivgas have this downwards sloping midrange. This will make the sound thick and bassy (relative to upper midrange). Other headphone on the graph is Beyerdynamic DT880 (2003 version).
Compared to Beyrs sivgas will sound alot bassier if listener adjusts the listening volume based on 1khz region for example. Some people crank up the volume untill bass is sufficient, others will adjust it according to how much treble they want and so on. When we re-align the graps so that they intersect at 1khz this happens.
I think Phoenix is a decent headphone. Tuning is bit weird, sound is bit congested and bass bleeds into the midrange. Soundstage is small. I sold mine.
@rev92 I think it's great that you came here asking what people think of the review. Many more renowned reviewiers should do that too every now and then. I suggest you should invest in a minidsp ears measuring system. It's not a professional tool but does well enough job for basic measurements. It's is about 200€. Just doing measurements would set you apart from the competition, not enough people do that.