Sett would be balanced if..
Sett would actually be balanced in lane if his E didn't have an absolutely disgusting hitbox, like this ability hits regardless of being near you or even perpendicular to him, this shit will hit. His shield is a terrible addition to this game, like seriously. All he has to do is get the shit kicked out of him, then turn and press W for massive and potential true damage, with the only counter play being flash, and half the time it'll hit you anyway regardless because the hitbox on this is also disgustingly large.
None the less Sett is pretty garbage out of lane, gets kited easily, and with movement speed acquisitions it is slightly easier to dodge these abilities. But this champ is pretty braindead and his laning is very strong due to how easy and forgiving he is. But this post will go nowhere because Riot is busy making another Lux or Akali skin, oh well!