This might be stating the obvious but the power spike is just unreal at the moment and pretty much all classes have oneshot cheese builds, even some of the builds that are not suited towards oneshotting oneshot you does with the sheer strength of power builds. Worst thing about it is that most of the times there is no counter play to it. It kills the fun because it doesn't reward me by getting better and more skilled at the game. I don't think I've seen someone running condi in a long while in WvW with the exception of some celestial scourges or roaming mesmers due to the power being so meta and the big condi cleanse wars.
Some people may argue that "Hurr durr just use your defensive cooldowns". Well that's impossible when a deadeye comes with stealth and oneshots a heavy armor user from 100% to 0 from stealth. Or a holo comes from stealth with an overheat rocket and hits heavy armor for 28k. This can also be done, again, from stealth, with power GS mesmers. The other classes I can somewhat agree to having some but yet VERY little counter play to it. Its basically the person that flunks the first dodge or defensive that is dead or if you're caught blinking for a second while running.
My suggestion for this, but it might be too late or way too much work to do, is to try to balance the game towards longer and more sustained fights that actually rewards you from being good at the game.
Gladly discuss why I'm wrong/right, what to do about this if you think this is a problem.