Ok...
Care to explain then how Nightstalkers; which according to your own data struggles to even reach, much less maintain, a 1.0 K/D ratio and appears to be constantly outpaced by every subclass of Warlock, were 'reigning supreme'?
If these statistics were the basis for determining the rebalancing of Hunters, why did Nightstalkers receive any nerfs at all. Clearly the abilities dubbed 'OP' by the community weren't enough to catapult the subclass to success. It was neck and neck with Sunbreakers and only did regularly better than Defenders (except of course during those four days on the memorial day weekend when Defenders finally surpassed another subclass). If you're going to start pulling charts to explain your reasoning, at least be consistent.
EDIT: So the whole point of this, which seems to have flown over most of people's head, is the fact that there was no statistical reason to nerf Nightstalkers. Like Sunsingers, they got hit just for being "frustrating". It's BS and a practice that can justify any nerf to any class. If that's how it's going to be, then Strikers are going to be next on the chopping block and I don't want to see that happen. There will always be that one ability or class that the community complains en masse is OP, and that's how it's always going to until everything gets nerfed to the point where there's no unique differences between classes. That will destroy Destiny far more than any content shortage ever will.
Sunsingers were never OP. In fact, I was always of the opinion that they needed a considerable buff to keep up with the new classes. Fire Bolt grenades where basically Incendiary Grenades that did less damage, were actually easier to dodge, and required two perks to even be effective. Don't believe me? Check out BA Gaming's video [url=https://www.youtube.com/watch?v=um1GmhM8rcA]OPness[/url]. Were there some abilities of the Nightstalker that were OP? Perhaps. There's certainly some arguments that could be made for Wombo Combo and Shadestep, but as Bungie's data chart shows, they weren't nearly the auto-win abilities everyone made them out to be. Like Firebolt Grenades, like Shoulder Charge, just unique to the class and occasionally "frustrating" to a few players. Not enough to warrant nerfs though.
All in all, it never ceases to amaze how many people still think Bungie knows best, despite the entire history of Destiny being evidence to the contrary.
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I'm guessing sunsinger & night stalker were changed because of their 3v3 performance. The graph only show 6v6 performance, & that was likely because people already knew why ns & ss were changed.