As a WvW healing Vindicator, I have to admit the class needed some sort of nerf even in World vs World, but I think Anet went too far. I don't even think they tried the changes they made, they just nerfed every single aspect to reduce stamina regeneration without even thinking about making the class underpowered again compared to the others.
I wonder why it took YEARS to balance Scourge and Firebrand (still not balanced) and some/few weeks to make Vindicator quite useless.