Title says it all. Who is a champ that you cannot beat. That when you see them in queue on the other team you actually contemplate backing out.

My pick would have to be Vayne. Every 3rd shot will deal extra damage, a displacement, invisibility... A barrel roll... nty

to be honest im most of afraid of rammus when im playing AD and talon when im AP, other than that i hate fighting shen, **** shen.

Zyra was preposterously OP, and her win % reflected that. It was over 58% basically since her release, going over 60% sometimes.

Also, I did read your post. You said "Title says it all"

i find xin pretty overpowered these days

Yes, the title was "Most OP Champ (in your opinion)" not "State that there are no OP champs and then contradict one's self by stating there are actually op champs and then give a statistic with no proof"

so far i dont feel any champ is OP but i do have prob when i face teemo but he isnt OP

While I don't think there are any crazy OP champs right now, I hate seeing Xin and Darius top. Xin deals crazy damage and Darius is just too much of threat for a "tank" IMO. I know that these aren't a crazy factor in organized teams as they both lack escapes and can be ganked hard. But in solo q, these remain anti fun in my eyes.

I also hate how hard you can get counter picked with characters like Talon mid, I don't like the fact that you can choose someone like him and almost always auto win the lane. That silence is just too much.