I haven't seen anyone say that. Echoing reprimand obviously needed a nerf and people were saying that since beta. Where they went too far was gutting the ability completely while also nerfing shadow blades. To put in perspective, most OP specs get abilities nerfed by 10-20% or so, like MM hunters. Echoing reprimand got nerfed by around 75% to the extent that it's no longer even used in openers. That's why people saying it was too much.
Personally I don't agree, I think sub is still fine, I just think they should spread the nerfs out to more specs, convoke needs to be gutted similarly by 75% or so.
Yeh gear is a huge factor now in pvp. Bursting someone with honor gear when you have 210+ ilvl yourself almost feels like attacking a low level target. Echoing reprimand needed a nerf for sure, but the one shots we saw early in the season were amplified by the low gear and bad understanding of the bursty meta we had. Sub rogue is struggling a bit now in the meta, and almost requires you to play with a fire mage to be able to survive long enough to get kills.
I have not seen shadowstrike like that ever and im 217ilvl sub rogue, maybe in battlegrounds with berserking buff + salt water potion + dagger in the dark talent, but never in arena and if you get outplayed by dagger in the dark pvp talent i got bad news for you...its like "hey im here" indicator for the opposing player.
Also that is not one global its two :3