Master Yi is an abomination and has to be reworked.
He only provides damage and is a worse carry, worse assassin and worse splitpusher than other champions in each of those three roles. I think his biggest problem is his lack of cc. We should let alpha strike silence for 2 seconds and during that duration, if Master Yi attacks the target they can be stunned for an additional 2 seconds like an udyr bear stance auto attack. This will not only fix Yi as an individual champion but make him healthier, and more interactive as he will be newly incentivized to teamfight!