Now before you strike down your mighty jellyhorn opinions onto me, understand this, gjallarhorn is the last exotic I'm missing on Xbox. I don't personally have it but my friends do so I have had first hand experience(via playing on their accounts). Let's start of with the basics PvP: let's all be honest, you could replace Gjallarhorn with any tracking rocket launcher. Truth has 10x better tracking as well. It's not a bad PvP rocket launcher but Hunger of Crota will do Gjallarhorns job and leave your exotic slot open. PvE: here's where Gjallarhorn shines. Kinda. How many people use Gjallarhorn as their exotic slot for things like: Void/Arc Nightfalls? Killing low level enemies grouped together? Or do you only pull it out for a single high health target? Because that's how 90% of people use it. If you aren't a Titan with ruin wings then I'd almost bet you don't use your Rocket launchers for anything except high health targets. So yes, Gjallarhorn is great at what it does. It's the go to weapon for killing things like the Templar and taking Crotas shield down, but that's about it. It's not game breaking, it's not OP, it's good for the single purpose of damaging high health targets. I really don't understand why people think Xur selling Gjallarhorn would be any different than when he sold icebreaker. TL; DR Gjallarhorn is really good at what it's good at (damaging high health targets) but if you're not in that situation(or a Titan with ruin wings) you're wasting your exotic slot.