Kennen's inability to duel is crippling when games are always over by 10-15 minutes
What's the point of having a scaling team fight-oriented champion in a meta where games are over both before team fights happen and before scaling happens?
This is exasperated by him being forced to build certain items that prevent him from taking advantage of his scaling, in order to function at all (Zhonya + Protobelt), and general inability to wave clear without running directly into the enemy champion/team.
EDIT: See this video, where I outplay Syndra and Lee Sin and still die because my damage is so fucking atrocious that I can't kill a 50% health Syndra who stays in my ult for full duration. https://imgur.com/GacsVgV
EDIT: Just played against a very unskilled Zed with Hexdrinker and lost, because my damage was so low that I could not kill him, period. At one point, he ulted me while he had 50% health (after he had missed everything on his previous ult and stayed in lane), missed everything, ate every ability and a full ult from me, and still survived to walk away with about 20% health left. This is absurd.