So when a headphone is good, which headphones is it comparing too? When it is detail, how detail are they and comparing with what?
When comparing with ibuds, my $20 Sennheiser HD201 is MegaHD-Fi for that instant. When comparing with my HD650 it sounds Low-Fi.
Sometime when someone upgraded their audio, the new purchase sound so much better than their existing one (that's why they upgrade in the first place). People share on the forum, more people purchase then and found it is true and recommended them. We men also like new toy, very much like when we are young "My toy is better then yours" and our friends wanting the same toy for themselves too. So when someone have more capable headphones purchased the same set, they felt disappointed.
There's a lot of really good truth in here.