it's probably because i'm just a massive noob but i actually have problems dealing with ap yi sometimes, he good sustain midgame, good roaming and pretty good harass with his Q (yeah it's avoidable but you have to move pretty far away and i find that i just get hit by it pretty much at random and BAM a quarter of my health is gone). i mean sure his lategame isn't as good as some champions but he gets fed pretty easily and imo if any champion is fed enough they're a good asset in a teamfight (especially if they're someone like yi with reasonable natural damage)Are they saying yi, darius, xin zhao or an assassin is overpowered?
i'm not a fan of the current midlane meta because i find that champions who do well at the moment are ones who get kills early and then scale well off them and i tend to play either more late game champions or more supporty mid laners when walrein says anyone can go mid he's pretty much right)