So Graves may be a tad broken...
Went to champion.gg, because I like statistics. If you click on win rate, he's literally the only thing you see. Oh, and apparently Kayle top has a 56% win rate, but her play rate is less than 1%, so who gives a sh*t right?
http://champion.gg/statistics/#?sortBy=general.winPercent&order=descend