Talk:Jhin/@comment-9775822-20160730081104/@comment-26001789-20160805150158

Armor pen is better early but Crit scales naturally with your build. The reason why people go Armor Pen on Jhin is that he is effectively an AD Caster and by negating what few armor your oposing laners have, you can effectively deal tons of damage to them while also being effective against Tanks and Bruisers who build early armor. It also is nice vs Supports, since most Melee Supports will carry at least 15 armor on Runes. Having 10/20 Armor Pen on you means you deal natural damage to them.

You will have to transition eventually into a Crit Build. You can also completely avoid an ArmPen build by going full Critical if the opposing team is full of squishies or lack any dedicated tank. If you are going into a full Tank Team, be prepared to build DuskBlade, Youmuu and LW alongside your IE or you will do no damage(yes, avoid any RFC, Statikk, PD vs any Tank Team, just build Armor Pen and Stack AD).