Katarina nastily overpowered
I just played a game (TFT 35:16) where a player built Katarina lvl2 (3 items). At the begging of every round she jumped ahead and immediately started spinning... dealing 14k dmg, according to what was written in chat. And that was only lvl2.
I had full roster of brawlers. And even chogath lvl2 with warmog and thornmail got ripped to shreds in a second.
What is the point of this? Very balanced... As it is there are too many unbalanced things to really enjoy this mode.