Lee Sin is a little weak right now
said no one ever. 
EDIT for serious-mode comment I made below, which I feel is worth pasting up here:
The fact is that even when Lee Sin is weak, he doesn't FEEL weak. He has a ton of options and a ton of utility - kinda like Thresh, except with Lee Sin you don't have to worry about braindead teammates flashing over your lantern. J4 might be statistically, provably better, but in my opinion - and the opinion of many others - Lee Sin is still more frustrating to play against.
He pegs you with a skillshot and then gets to decide whether or not to instantly teleport to you. Chase him down in the jungle? Too bad, he can ward-hop for free. Got him low? Well, he's got lifesteal and spellvamp built into his kit too, on top of a free shield - he can just beat up camps for a bit and he'll be right as rain, whereas most other champs would likely have to recall. He does so much and he doesn't appear to pay any price for it... at least with Jarvan I can see his windows of vulnerability.


What's black and blue and is about to show you the definition of...