@Meddler: What are Lee Sin's "levers of balance"?
You gave us a good explanation on Bard's balance levers a little bit back, which really helped to show us how he can be tweaked for balance purposes.
On another note, it's no secret that people are hugely divided on opinions about Lee Sin. Some say he sucks if he doesn't snowball early, while others think he is oppressive as an early jungler due to how hard it is to counter his versatility.
And yet despite all the debate, Riot doesn't significantly change him. This leads me to believe that his balance levers are either "hard to pull", or that he just doesn't have enough to pull in the first place.
Can you give us some insight as to what balance levers Lee Sin has? It'd certainly help to give more context to his current power level.