Yi should be removed or reworked
Why on Earth would you give this champion true damage on top of everything he already has? This champ design makes no sense. Honestly, he's one of those champs that have almost literally no counterplay when ahead, and certain team comps cannot stop him no matter what they do. Assuming your team even has targeted, hard CC, he can build around that and oneshot the entire team, including tanks. He has absolutely no problem running past your front line (or just killing them) and murdering a carry, by himself. Oh, and he also kills towers quickerer (lol towers, they're so kawaii).
Anyway, I can't say he's the most broken champion in League, but he's certainly the last fun and most frustrating to play against. Especially as a tank or adc.
tl;dr
Yi killed me in less than 3 seconds and as Mundo and I don't like that. mad cus bad. etc
But seriously, why make a champ that just pisses everyone in the game off?