LeBlanc - squishy as fuck, easy to shut down, like all assassins is very predictable.
Ahri - her mobility is what makes her annoying, yet she's quite squishy and isn't immune to targetted burst like
, is 100% skillshot - I hope you can avoid them at this point.
Nidalee - she's strong right now, yes. She has an incoming nerf, though maybe not exactly the AP scaling nerf she needs. Quit complaining about her.
Zed - requires great mechanics and knee-jerk reaction times along with knowing how to blow a combo to 100-0 someone safely in the mid-game and late-game, particularly when there are so many in-game mechanics to work against you.

Lee Sin - why do people still complain about Lee? He's hands down the hardest champion to master. Yes, he has a lot in his kit. Yes, he's overloaded. That's exactly why he's so hard to master.
You want to optimize mobility? Great, buy a sightstone. No sightstone, no supermobility. That limits you to 4 options for itemization. Why in the name of God are people so butthurt about high skillcap champions shitting on them when those champions take so much more time and practice to learn to that skill level than, say,
who are all still more than useful. You should appreciate the fact that someone put in the time and effort required to learn those high skillcap champions.