J4 needs a buff to his early game ganking or late game engage.
Right now J4 is struggling both top and jungle.
He is an early game burst damage ganker that transitions into an engage tank later. Usually he builds 1 damage item then full tank.
Raising his later damage doesn't help him. He's not used for his late game damage, although it is substantial. He's used for his early damage.
The big thing is making his clears or laning easier and him more dangerous in lane. It's sad too, because he is sooo close to being balanced instead of underpowered.
That means he needs passive armor or damage reduction back (at the least) and his cast animations should be smoothed out so he spends less time winding up his Q and more time whacking people.
Even these tiny buffs would likely increase his win rate to around 50%.
