I don't think it is.
Before its all like "enjoy your whine and cheese - get gud skrub" lets look at some very simple facts.
Of all the 1HK methods of dying in Crucible, nearly all of them have a cooldown or are otherwise limited.
Supers - Cooldown
Heavy - Limited ammo and timer
Particular 1HK Melee - Cooldown
Shotgun and Sniper final round - Limited ammo and timer.
Particular 1HK grenade - Cooldown
Any others that I have missed?
The thing is, Shoulder Charge is a 1HK and you can spam it all match, every match, I know it does technically have a cooldown, but its so short (few seconds) that it really becomes a moot point.
Also note this is a unique option to the Titans only, giving this arguably very powerful negligible-cooldown 1HK ability and other classes don't have a similar feature or ability.
My suggestion for a fix? Connect the shoulder charge 1HK capability to the melee cooldown. If you shoulder charge and you have a melee ability available, it is a 1HK, if melee is in cooldown, the shoulder charge does of course does damage, just not a 1HK.
In other words, make it work just like the melee attacks that can 1HK, if they have the ability primed, then dead, otherwise it does less damage (generally a 2HK or so, just like normal melee)
Thoughts?
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Maybe it is because I run shotguns, but I can't remember the last time I have been shoulder charged. It is high risk low reward.