Something no one claims needs nerfing but needs it the most - Feeding
Feeding didn't used to feel so bad, you were getting crapped on but you were worth very little to the enemy team, but games lasted longer back then and damage didn't come in extra large like it does today
The snowball that the game gets due to feeding (we know sometimes you have bad games) right now is insane, to the point where it becomes impossible to attempt to catch up or else you risk feeding even more, it tends to make teammates very angry because they are losing hope to face that 8/0 Darius
Riot really need to look at how gold is effected by dying a bunch, they did it in the past but it needs a re-adjustment, some champs just have bad early games and terrible matchups, for those I feel like the game should not literally be a death sentence because the other guy has 1500 more gold then you by 10 mins I don't mean make it super forgiving, just allow it not to make games completely one sided