I find ASR useful, more or less for the same reasons @analog_aficionado mentioned earlier.
What I find tiresome there is the constant bickering, the constant subjectivity bashing (the most popular threads!), and the general disputatious mood that pervades the discussions; many members are arrogant and too ready to argue rather than discuss. Amir calls for "happy" people interested in fun & learning, but it seems that he has attracted many "unhappy, bitter, and argumentative" members instead.
Too bad!
Regarding testing & the ratings, the ASR formula is simple: whatever measures better in the battery of tests performed rates better. However, unless the reader knows how to correlate the measurements to his (her) auditory tastes, the measurements are meaningless indications -- entertainment material at best.
You may or may not like the sound, i.e. the rating does not necessarily indicate which device you'll ultimately prefer, so you are hardly going to use said measurements as the ultimate buying choice.
Neither do many of the members. IIRC Amir himself uses old ML class A monos, not high SINAD NCore or Purifi based products.