I can never seem to do well against her, and the stupid 5v5 teamfight shit drives me nuts. Plus she's impossible to gank against, so when my top laner inevitably ends up feeding against her and begging me to gank it always pains me to explain why I can't in chat, as I want to help them but I just simply can't.
Either 30/0/30 by five minutes on the enemy team or 0/30/0 on your team and telling everyone on the enemy team to report all of us because we all suck. But in all seriousness I hate Lee, he's so safe, deals so much damage with that ult, and can gank so much more often then me as Rengar.
I loathe this champion. He has that stupid built in zhonyas on such a low cooldown, an ultimate whose hitbox is about the size of an Ashe arrow even though it clearly doesn't look that large, everything about this champion pisses me off, especially as a Rengar main.
Assassins should kill any ADC. Vayne is the exception, she does so much damage, and has so many ways to out play you it's simply nuts. Combine this with Vayne players DCing pretty often and I just hate them.
The ultimate counter to any assassin. She has a root that lasts for about 10 years that's not even an ultimate, and come late game binding plus that ground spell is enough to almost kill you. Combine this with that black shield and you've got the ultimate annoying support.
(edit)
I almost forgot this stinker. She has the same levels of CC that Morgna has except its on her passive, and tibbers is an AOE nuke stun that's instant casting. Combine that with her insane burst and you've got a champion that should be nerfed or changed in someway, but probably never will.