I didn't felt so usuless in any game ever, while being so ahead.
Like wtf, I want to get my platinum back, how can teams be so unbalanced????? I have taken master yi, at level 12, I was 4 levels ahead all enemies and 7/1. Everyone in my team was flaming me, because I was covering lanes or pushing them in to make enemie lose cs or "not" ganking. I didn't had much assists, becouse, I couldn't gank my bot or mid lane, I tried to gank them everytime I finished my camps and then I did it succesfuly, obviously, I took the kills.
If I was trying to gank any one, except top, enemie would fall back and if enemie jungler would have tried to gank, my team would still fight, even then I wasn't there... Later if I tried to group, my team would have insta died and I couldn't do anything alone, even then going tanky. I tried to split, my team still loses or pantheon in my team uses hes ultimate to come in to lane before me, even then he knows that he cant 1vs1 anyone, he proccesed to split and die...