On a dedicated Dex build at most these things get 365 AR with Sharp infusion. It's worse on a quality build, yes I checked. The only way they get that much AR is if they somehow get you with R1, L1, L2, R2 and that is almost impossible to do unless you got yourself stuck in the environment. The range is abysmal and easily countered by Straight Swords, Longer Curved Swords, Spears and other pole weapons. You can not combo these weapons from range you have to be extremely close which means spacing and timing needs to be damn near perfect or you get brutally punished. You just had bad luck or your internet isn't great, either way these things are not the nightmare you describe.