"Hair Metal" is a derogatory term and was actually coined for greatest hits compilation albums 10 + years after that era had passed for bands that were all image and no substance. Unfortunately a few legit bands got lumped into that but for the most part, if a band was labelled hair metal you can automatically assume they were musically garbage. Furthermore, back in the day when it was actually happening, this so called hair metal was referred to a glam metal. Which is funny because none of it is really "metal" at all. It more closely resembled pop music with the only metal component to it was distorted power chords and shred solos.