The real issue with the game is that one champion can prevent you from doing anything

Master Yi? You can't extend past turret, ever (and mid-game towers won't stop him). Stepping out of base means you're susceptible to him leaping on you out of nowhere.

Kha'zix? You're forced to stay by your team or a minion wave at all times or you'll take double damage from his Q.

Heimerdinger? No more lane for you, just hug tower and try to scrape cs if you can.

Quinn? If she's top, I hope that caster minion was worth half your HP. If she's jungle, she's worse than Hecarim in that she can come out of fucking nowhere and destroy you.

Draven? You better have poke because your lane turned from "compete for tower" to "compete to not fall behind in CS."

Mundo/Vlad? Forced to rush anti-heal item that tanks your damage, in Mundo's case he has a permaslow so you have to pray you aren't hit by the first Q or you have a dash.

Talon? His E mainly is the issue, he can leap out of nowhere and ruin your day.

Veigar? If you don't end the game by 30 minutes, you lose.

Jhin? He can probably outrun most mobile champions honestly.

Fiddlesticks? Rush a QSS/Zhonyas or he'll be all over you. Also really long-range free poke.

Annie? She turns from laughable to your worst nightmare at 4 stacks of passive.

Brand support? He does more damage than the ADC (with more range) until 25 minutes.

Maybe they aren't broken by themselves but these champions can disable you and your team for the entire lane phase/midgame/entire game. There is technically "counterplay" but you'll likely never be able to counter them unless you're playing a similar champion because you'll be unable to reach them or react half the time.