In my last match, which is still going by the time I write this (I left because I had no stomach to play against Ekko), he just dealt 1741 damage to me, only with his ult. Dear RIOT games, please do something with him, because he is worse than Zed, Yasuo, Vayne's W, and Darius' Ult (in it's prime), combined, on the Teemo'th-power. Even the Darius ult doesn't deal that much damage. Even the Cho'gath ult doesn't deal that much damage! And it's just the tip of the iceberg!
He has no skill that doesn't do at least two things, and one of these is either movement or CC. He has the same problem as Irelia, but the case is much much much worse. They can do too much things. (But Ekko tears off everyone's face with ease.) RIOT I'm begging you, please rework Ekko, because I have no stomach to play against him, and I'm really starting to consider where the game is going with champions like him, Zed, or Yasuo.
A player who had too much...
Edit: Just to be clear guys, I wasn't chasing him, I was in a teamfight, trying to kill someone other.
He had 967 AP, and I had nidalee's base magic res (30). Try to do the math with these numbers, you will get the 1741 dmg.
Here's my match if you want to see the result yourself: http://matchhistory.eune.leagueoflegends.com/en/#match-details/EUN1/1174761566/25055797?tab=overview