Lee Sin =) Balanced and healthy
http://i.imgur.com/p4a4dDN.png Ok Lee Sin's wiki page http://i.imgur.com/kXYVxSd.png Look closer http://i.imgur.com/1zeLggq.png Do you see it now?
http://i.imgur.com/99rbWFw.png Maybe this will help http://i.imgur.com/uLAKqrz.png Better? http://i.imgur.com/SuVlgWp.png Maybe this will do the trick http://i.imgur.com/Gk9J4kp.png Comeon by now http://i.imgur.com/XJWbytz.png No this isn't Riven trust me
So let's add some stuff up shall we? Let's say Lee sin is level 18 this means that his base damage is 116
He builds two damage items
+ 
= 75 + 40 = 115 AD + 15 AD ( Runes let's forget masteries ) = 130 Bonus AD
His total AD is 130 + 116 = 246 AD
Sonic Wave - 340 Base Damage + 234 Bonus AD = 574 Total Physical Damage(+ 8% target's missing health) Tempest - 200 + 246 Total AD = 446 Magic Damage ( Yes he's fcking hybrid damage ) Dragon's Rage - 600 + 260 Bonus Damage = 860 Total Physical Damage Let's not forget his 25% Lifesteal and Spell Vamp kids.
Let's say the enemy has 5000 health and this is not taking inconsideration Armour or MR. Basic Lee Combo - Q - E - R - Q - Damage Diagram - 287 - 446 - 860 - 287 + (1880 x 8%missing health) 150.4 = 2030.4 Total Damage and he could spell vamp 507 Health back and I am not even going to calculate life steal. So without any basic attacks or Ravenous Hydra splash damage or active taken into account he can deal 2030 Damage with two damage items and then build 3 tank items and laugh whilst he tanks all the damage..
I personally thinks he needs to be buffed a little. Not even Talon does so much damage and he's a damn assassin. Since when are fighters supposed to do so much damage Riot? How can this be his damage as a semi tank or full tank?
Edit: I forgot the 
+40 Damage well with it he deals
170 Bonus AD
286 Total AD
Sonic Wave - 340 Base Damage + 306 Bonus AD = 646 Total Physical Damage(+ 8% target's missing health) Tempest - 200 + 286 Total AD = 486 Magic Damage Dragon's Rage - 600 + 340 Bonus Damage = 940 Total Physical Damage
Basic Lee Combo - Q - E - R - Q - Damage Diagram - 323 - 486 - 940 - 323 + (2072 x 8% missing health) 165.76 = 2237.76 Total Damage.
