Kennen

For a champion that has to run through the enemies, he really has crappy mobility.

Kennen's mobility is just a joke in today's mobility meta. and the list goes on. Any of them are way more mobile than Kennen for some reason, and none of them have to run through multiple enemies at the same time to deal their damage.

Kennen's base damage on his abilities is extremely low. Have you noticed when you E+W a full minion wave, all the minions survive with low health, and then they die to your friendly minions before you can last hit them, losing you all the gold. Most champions can farm better with one ability than Kennen can farm with 3, and they don't have to make themselves completely vulnerable to a gank when they use an ability.

In addition, the energy cost of his abilities is really high while his energy recovery is really low. His stun only lasts 1 second instead of the usual 2 seconds like other mages.

This champion needs some major help. He's a late game team champion in a game that rarely lasts until late game anymore.