Look at my name.
When someone says that they are correct.
Yi is stupid strong because most people don't realize you can't AS slow Yi (little known fact that makes Yi ridiculously strong) and often I have issues dealing with his damage because he is doing 30+% of it as true damage. And on top of that a good Yi can basically dodge 99% of abilities.
I suck at Yi because I forget to turn on my auto attacks. After Alpha Strike I just stand there for like 5 seconds waiting for them to die.