I think those who enjoy the NH enjoy the marketing more than the product. If Skylar didn't post all that stuff about accuracy people would say it's a mess. I think the NH is an absolute mess, mids drowned out, too much mid bass, treble is so uneven, huge peaks, dips trying to be smoothed over by the mid bass and cup reverb. That said it didnt stop me listening to it and owning it for 6 months. It was easy to drive, the driver itself was good, fostex drivers are great. They were so comfortable, I loved the look, build of it.
The whole speaker presentation doesn't work in headphones, especially one that was basically closed, with a little bit of controlled air flow. The only headphone I've heard that sound closer to speakers is the Verum One, which funny enough was made by a speaker builder. If Audioquest gave Sylar soke more time, I reckon he couldve came up with something better.
Technically nighthawk was a failed project but I don't really see it like that, it was interesting, the design had innovation, it looked good, smelled good(IMO) it just didn't have the right housing for the driver.