As a Yi Main for over 3 years......
I have played Yi as my main jungler for over 3 years and i have experienced every possible good build paths for him and i have to say ,right now the thing that makes him totaly broken and hard too counter is Sated devourer. This season i almost never touched Yi because of the feeling that everyone plays him and i just dont feel like playing him anymore. If riot is gonna go for nerfs they should really tune down sated and rageblade before anything else because when they nerf champs and then their core items they end up like sejuani and unplayable.