you know, for the longest time I admit I was a biased noob who hated Leblanc and called her "OP".
Leblanc, in the right hands...is indeed well...deadly. and her burst is nearly unrivaled while being mobile, and safeish.
but after playing against leblanc's in my own elo I see something about her differently now. She is incredibly high skill cap. And you can punish her pretty damn easily if she does even the slightest thing wrong. Use W and miss? she is getting chunked for huge amounts. Use her ult Q and then not follow up? punished. you can even punish Leblancs who start obviously walking up to you to combo. Leblanc is pretty telegraphed in what she has to do. so there is some counterplay there.
Her damage has always felt too high, but its not like she doesnt have drawbacks. her mana costs early are noticeable and if she cant outsustain you, you can just push in her wave and screw her over. she is also super duper squish. even more squish than the average squish.
Still a little overtuned in pure early game damage, but beatable for sure. not "op" on the level of mordekaiser, darius, fiora, etc.