Every update has more and more damage nerfs. At some point you might as well just change PvP to carebear land considering how hard it is to kill other players with anything other than group numbers.
My favorite damage nerf still has to be the nerf to the sharpened trait. While yes it was pretty ridiculous how over-performing this trait was versus the other traits, instead of bringing everything else up to sharpened's level they decide to cut it in half effectively dropping everyone's damage by 5%. Excellently done.
What's yours? There are lots and lots of good ones available!