don't get me wrong i love sett, but doesn't lee sin do the same thing with his ult? and with the lifesteal and spell vamp he gets passively from his w plus his passive which gives him a bunch of attack speed, doesn't he fulfill the same ideology of getting into the middle of a teamfight?
maybe lee is just too much of a jack of all trades. good at f**kin everything.
Not really. If you watch the Champion Spotlight video, you can examples of using his ult on enemies with varying health. So, when he uses is on the Ashe he does almost no damage, but when you see him grab the Cho and bodyslam him into the Ashe, she's almost killed.
Lee's ult doesn't scale off of enemy health (afaik, I will never play that champ).
Sett also has a unique mechanic where all the damage he takes is stored as grit and then he can unleash that on his enemies. So him standing in the front line and taking a beating is the exact thing he wants, because it makes him stronger.