I agree, when I got my HD6XX they definitely didn't live up to their hype. They have amazingly good mids and accurate and natural tonal balance, which make them ideal headphones for playing human voices (like audio conference call, or listening to the talking heads on the Youtube), but for music listening especially if you are into something hardcore, like Grange, Garage, Anything-Metal, EDM or Rap, they are disappointing. For classical music I would also prefer something else. For $200 there are plenty of really good headphones like AKG K702, Grado SR225x, Beyerdynamics DT880Pro, or even HD560 to concentrate so much on HD6XX.

I am a drummer and while listening to my toones, I focus specifically on drums which are living in the corners of the spectrum - sub-bass (bass drum) and highs (cymbals of any kind) and HD6XX is delivering neither quantity, nor quality of those ranges.