Statisticly, Lee Sin is Not as good and Not as difficult as people claim he is.
A lot of people say that Lee Sin is by far one of the most difficult champions In league of legends, and can be very strong If you actually play him a lot. But according to champion.gg, Lee Sin is probably one of the worst champions right now.
If we look at his win rate for people playing him for the first time, it is unsurprisingly low, at around 45-46%. However, when we look at people who have played 150+ games with him, that percentage goes up about 2%. So even people who have played him a lot and know him very well dont do well with him.
If we look at another champion, like aurelion sol, people who play him for the first few games only have around 46 percent win rate, which is understandable. However, after playing 150+ games with him, people have around 55-60% win rates, which can conclude that aurelion sol is pretty OP if mastered (same thing for nunu and galio).
Lee Sin is not in a good spot right now.