You need your whole team to protect you, to peel for you, you need to check your position... And for what? To do what any bruiser or assassin can do 10 times better and without all unnecessary headache. Assassin - jump into the team, kill two squishes in 0.00005 seconds, jump out. Bruiser - crash into an enemy team, deal ungodly amounts of dmg, give your assassin quadra or penta.
Ok, maybe assassin-like super mobile adc's can do something, like Tristana who can deal some dmg and then jump out nearly across the map where no assassin can follow.