I think the rampage is fine, it sucks quite hard at close range outside if its charged. To charge it you have to stand still... Its a risk reward kind of weapon, but its decent mid long range with the correct setup. Because of this I think its fairly balanced as it is. Still it was 6 hits for 200 damage 🙂 I know its irritating when someone pulls off a lucky play on you but its even more insane when you meet the headshot gods with a wingman :P
(Im not refering to bugs and exploits on the rampage, they obviously have to get fixed, but I dont think it needs a nerf)