As jayce, Jayce is really good at poking enemies down with his w > s combo. He can even one-shot targets if he is far ahead of the enemy team. This will allow him to create an advantage for his team before a major fight.

Once Jayce is full build, no squishy enemy target in the game is safe. This is because he can easily blow enemies up with his w > s combo. Sometimes a single combo is all it takes to kill a target (like a squishy support, for instance). All he needs to do is sit in the enemy Jungle and wait for an unsuspecting enemy to come near.

Jayce won't spike at level 16 either because his Ultimate G won't be providing with him a lot of raw stats, which other champions' ultimates offer them with. He will still have to rely on flanking and using the fog of war to poke enemies down. The greater the number of enemies hit, the better it is for his team and him. As jayce, Jayce is really good at bringing down the enemies with his combo w > s. He can even targets at a single shot if he is well ahead of the enemy team. This will allow him to create an advantage for his team before a major fight. Once Jayce is complete, no squishy enemy target in the game is sure. That's because he can easily blow up the enemies with his combo w > s. Sometimes, a single combo is all it takes to kill a target (such as a squishy support, for example). All he has to do is sit in the enemy jungle and wait for an unsuspected enemy to approach. Jayce won't rise to level 16 either because his Ultimate G won't provide with a lot of raw statistics, which the ultimates of other champions offer them.