The moment i wanted to stop playing lol instantly

Ok so i know a lot of people are forcing riot to nerf some champions but this is actually hell. i played sona with my friend ashe and we were again caitlyn, i was at lik 45% of the health, and caitlyn just throws ultimate and kills me instantly (she had one item). when i asked her how, she said that it is cuz of dark harvest. what, just what it happened in like tenth minute. this is my first time to get one shot by dark harvest, is it always like this? cuz if it is,omg.