I know I'm going to be down-voted by every single lee-sin hater who refuses to objectively look at stats and other data.
Over the past month, guess where Lee Sin sits in terms of winrate? 45%. Yes, win rate isn't "everything" but let's take a step back and really think about that statement.** If you play Ranked (and or are a pro player) what do you want to do?** Win. How do pro players make worlds and get high cash prizes? By winning. What do you think the pro players care about? Winning. So, if a champion, like Lee Sin, Leblanc, or Rengar, are really low on win rates, aka people are LOSING by playing them, do you REALLY think that they will keep playing those champions when their** JOBS or RANK depends on them?** No. So, yes Lee Sin isn't "overpowered".
Now, let's actually look at why people hate Lee Sin so much. He makes "flashy plays" and is "dominate". Well Mr. What do you consider dominate? I mean sure Lee Sin is played is most games at the pro level. Even so, he's only breaking a tad bit above 50%. Yet, if we look at Rammus a jungler who isn't considered amazing, Rammus pulled off 100% win rate in 3 games also having the top KDA for the role in those 3 games. Yeah... Let that sink in. So, everyone is complaining about Lee Sin because he can make "flashy plays" but his stats like KDA and Win rate don't paint him as a top overpowered jungler. So, why are we screaming for his head?
Lee Sin simply has the same syndrome as Shaco or Leblanc had. Everyone hates them because they are simply annoying to play against. So, in all reality, if you just hate lee sin because he's annoying that's fine. But, if we look at Leblanc who wasn't even over 48% at her prime for winrate (which people cry is an underpowered champ then), people whined and complained about her being "OP". But wait, if under 50% win rate by a lot, like Lee Sin at 45% win rate, is underpowered, WHY IS EVERYONE WHINING HE'S TOO STRONG? And the simple answer to that is the skill floor. Lee Sin is a champion who is terrible, but in the right hands of pros who have played hundreds of hours on him can actually make him work. He is really crappy, but the base utility of his kit allows pro players to make #LCSBIGPLAYS because they can perfect his combos. He is worthless other than that. So, people hate Lee Sin because he has a super high skill floor that can be only utilized really by people with hundreds of hours on him. Is that **REALLY **op?
tl;dr: Yes, Lee Sin is annoying to play against, but where is the raw data to back up he's "OP" as claimed? By standards set by the community he would be considered "underpowered" except people just hate playing against him. Please be objective before you cry for champions to be gutted.