Just because someone killed you with an ability doesn't mean it needs nerfed. What ends up happening is, they kill you with their ability you cry "nerf" then when you kill them they cry "nerf"
Every ability has a counter or a way a to defend against it. The fact is that certain classes/builds are weak against other classes/builds. IMHO thats the beauty of PVP. I mean do you think that when sypher, king richard, or lefty lucy cry about how certain skills are overpowered? No they tweak their own builds to counter what others are doing, thats what makes them great players.
If people stop crying "nerf" everytime they get killed by a skill, the community can actually point out when certain skills are truely overpowered.