I just completed the Green fire quest line. I wanted to do this on my lock since it came out, but I just leveled him to 90 this week. As hard and as frustrating as it was, Its seems like a huge accomplishment.
Now in order to keep this "unique" I believe it should be buffed each major patch to keep it that way. Its in no way affects the gameplay, its just cosmetic, so why not keep it a challenge to obtain it.