The way that I see it is that the "good" players and/or who heavily play crucible see that there's a big advantage to being a hunter and therefore use it more generally. The hunter's supers both are 2 of the 3 that can be used continually (the other being that of the Sunsinger subclass), granting more freedom to get kills. The gunslinger can get a maximum of 3-4 kills and the user can run around while using it. Not to mention how accurate the golden gun is with the right amount of experience/skill with it. The bladedancer can more or less have a nearly indefinite amount of kills until they run out of energy. Also the fact that the user can take more hits, run around more quickly, and the lunge with the blade covers a lot of ground helps to justify usage. (The sunsinger can do things similarly to these, but they are restricted to all the base things that the player has with the exception of being able to spam grenades and revive themselves, but they can easily be killed with preparation and being able to see it coming) These supers definitely permit more freedom than most of all the other classes and are likely viewed as more useful by more PvP-centric players. That's just speculation though. Not attacking PvP players or hunters at all.