I think this is why Zed doesn't get nerfed.
While watching a video on youtube, someone said in the comments something that explains most Zed players.
"Look at the ffcking retarded item (zhonyas)...it would have been an easy kill, but the zhonyas is so long ahri just needs to press it and has not to think about when she caan avoid the most dmg"
Did he really just say that Zed would have gotten a kill if his enemy mid laner didn't spend 3k gold on a zhonyas? If a champion gets a kill EVERY 90 SECONDS, unless his enemy rushes one of the most expensive items in the game, you know thats too much. Balance zed, the only people that defend him are the ones that are still trying to grab freelo.
With the logic that there is an item that can help survive from zed, there's people thinking that zed is balanced, and boy oh boy, are they wrong.
Riot you really need to nerf zed, increase his ults cooldown or give it a timer so he cant ult back out immediately.
...people and things like that.