Yi is 3v3
Look I know the game doesn't balance around the 3v3 game but without things like warmongers armor thorn-mail and wards I've noticed there just isn't really countering yi. Even without him getting armor pen (they usually don't bother) most armor options fall off quickly and far too hard and his natural movement speed nixes any attempts at running too and this is without anything other then second level boots.
I've been playing this game for around three years now and find I just don't like the general crowd in five on five so I mostly only go 3v3 but yi has been a pain in the ass every weekend (Hello high-schoolers and college weekend players ;) )
Could some sort of item or items be added to help offset him maybe a little?