The most genuinely annoying champion in League of Legends
is this guy 
I'm MEGA tilted right now. I can't think of a champion that is currently less fun to play against. Beat him in lane kill him a few times and then by the 40 minute mark you still need to bring 3 people just to take his ass down. It's ridiculous. Whoever created this monstrosity - I want to throw a box of eggs at your house.
SO. FREAKING. ANNOYING. Also, yes I'm Silver, I suck anyway but holy shit I've never been so pissed off
that's pretty much it... just needed to rant for a sec... what other champs do you guys hate playing against / are a huge pain in the ass? I know
annoys people too but he's not even CLOSE to hitting the Malzahar level of intense frustration

shroom and losing half your health as the adc.
and when he ults someone he's basically ccing himself and you can easily kill him then
tho..