Ok, you lose the opportunity for ganks BUT, difficult tank champs that make jarvans life difficult early game can be easily killed early. Don't forget you are Jarvan and for looking this guide your are maybe main. So, your passive in combination with thunderlords and e q can outplay lots of champs and with ignite first blood is guarantee.

I prefer dorans blade or if i m bored dorans shield. Dorans blade in combo with this items and masteries provide you with alot of sustain plus you have some extra attack speed cause jarvans e happens:P Dont forget to use your passive to least hit minions or your e q corectly to clear big waves. TIP: When you get your Sheen spam its passive on towers.

This guide is vs AP for example vs swain vlad or teemo etc