I will be completing Kings Fall challenge mode on each character, but honestly I don't care about getting any of the weapons. The only one that I will consider keeping is the Smite of Merain, and that is only if I pick up the one with firefly. I have close to 80 kings fall completions and have gotten all the weapons to drop countless times. The only one that is really worth keeping IMO is the Heavy Machine Gun. That is the only gun that I really kept from doing this raid. I know that most will say the sniper is a beast in PVP but I would say there are plenty of other options available that are comparable. Overall Kings Fall raid weapons have been the worst raid weapons in this game. Even making these weapons exotic and giving them burns will not make them much better. Definitely will not be wasting an exotic slot by equipping these guns.