Cry more. Legendaries are one of the few places in game where the developers don't have to, or specifically don't want to, worry about whether something is balanced for pvp. You don't get it through pvp, you get it from raiding. To hell with pvp balance. They didn't nerf Shadowmourne in pvp, they didn't nerf Valanyr in pvp, even in classic someone with Sulfuras in a bg was someone you get the fuck away from.
I'll wholeheartedly support the banning of anything in the game in pvp the day Blizzard implements pvp- and pve-specific effects for every single spell in the game, so that when something needs changed for pve content it's not because a bunch of whiny bitches cried that it's op in bg's. Unless and until they do that, I have no sympathy whatsoever for someone crying about something only gained through high end pve content being unbalanced in pvp. You learn to deal with it, or you give up. It's that simple.