Jax
One of the most overpowered champions in this game, if not the most overpowered. He has been for the longest time.
Jax can take on an entire team by himself. He scales absurdly. He has zero mana issues, with extremely low cooldowns.
His damage is off the charts. He is extremely tanky. He has ridiculous mobility.
What exactly is balanced about this champion? What about him can you even call a "weakness"? Of course, there is nothing. He is all benefits with zero drawbacks.
As soon as the other team has a Jax, you know that you are going to lose. It is just that simple. Unless the Jax is a first-time player or wants to lose on purpose to troll his allies, there is absolutely nothing you can do to stop him.
Nerf this bull shit and let the game be played. Games should not be won at the champion select screen.