A lot of people think that kennen is braindead and huge lane bully,but they forget that hes actually a mage and a lot his damage comes from landing spells(mainly his q). One thing you have to keep in mind as kennen is that you are a mage with 0 sustain(unlike champs like sylas or ahri). This means that you have to space the enemies very well so that you can hit them with abilities while they cant hit you. It also means that you can get punished very hard for overstepping against champs like darius or sett.