As an ADC main [and Riven, but you know -- not toxic], I can tolerate practically anything other than being blown up by being within a radius of any champion that isn't even designed to be burst, but still 100-0's quickly or tanks enough to kill my mediocre sum of health in a relatively quick time frame. I did like S5 immensely however.
At the moment: Bruiser/Tank Ekko, Bruiser Akali, AP Sona, Tank Malfite (bursting, tanking and killing is understandable -- but an ult like that enabling to 100-0 with near 0 counterplay even if you have vision is triggering), tank Vi, and tank Xin (even when a Xin was afk for 7 minutes and 3 levels behind with 2 items less bursted down an ADC quickly while initiating beyond ADC's range -- however Xin is not an inherent problem, just a toxicity issue of damage curve all around).
It's a little frustrating and the role [marksmen] feels nearly useless this season unless you have good CC/Utility in your kit to provide something to the team because otherwise you sit and twiddle your thumbs to hope to just clear minions and take turrets and not get one/two shot. (i.e. Ashe ult and vision, Jhin W, traps and Ult, Caitlyn traps and safety range, and Sivirs ult + high waveclear.) There's so much damage going around, that ADC is just for the AD siege habit at this point. You don't need to be a late game monster, but there should be some room for outplays on either side during all phases of the game in some individual way to prevent snowballing from being overwhelming and late game from being overly oppressive. Even at S5 when ADC's late game wasn't melting everything in sight, there were mechanics that made you out to be more useful -- kiting, orbwalking, positioning, casting when and who, etc. that changed the flow. It's healthier when they aren't melting everything imo.
Perhaps it's good ADC's are taking a more team oriented role now, even if the state of such is crude at the moment and needs refinement to become less poisonous; however it is certainly not at a point this season where it is healthy or acceptable -- or even to assume that it just a problem for ADC's, but for pure tanks as well who feel nearly useless unless they have incredible teamfight like Maokai and Gnar (technically bruiser, but even full tank is very useful), or are named Rammus.
//end rant
< great item, 
< gives health and magic pen. 
!!! Come on not hard at all!
Get upwards of 6000 health with 
