I don't know why everyone rips on adcs so hard...
In my opinion adcs have the shit end of the stick, except for a few select champions. I'v always seen it like this, a fed adc can kill anything, but a fed anything can kill an adc. I have been super fed as, say jhin before and been fucking anally destroyed by a fed nautilus. If you're 20/0/10 as jinx a 10/5/5 kha, zixs will rip you a new one... or a hecarim or what not.
I honestly dislike playing adc just for those reasons. So many tanky champions can burst you with one item *
cough*
cough that I find it quite fair. Yes it does suck when there is a fed enemy ADC that three shots your whole team. But honestly a fed anything can almost do that.