i also play a tanky jax and got thirtyfive kills caus the other team could not ignore me, but i perfer to switch either force of nature or rageblade for another gunblade because of the extra life steal

Jax has a lot of attack speed/damage steroids.

Atmogs+some AD = plenty of damage.

Jax has to be built tanky now because they left out the HP on his passive.

He does good base damge though, it's kind of silly to think that he can ever be ignored.

Seems you're some1 of those guys who dont read the guide, so I'm just saying now, that jax still does good damage even if he's a tank, and about your first argument, just play defensive and farm until you have your gunblade

Until you manage to finish your Hextech Gunblade you have no damage. Building Warmog as first item is...dunno, just not good. If you imagine you will play versus me - solo top, ok? Lets say we have same farming, same kills = same amount of gold. You finish Warmog, I have Sheen and Phage. You have 700 HP more than me, but you still play with basic damage. And my damage is awesome now, with only two items.

I suggest to build at least Bilgewater Cutlass before Warmog.

Last thing that is the worst here. "TANK JAX" WTF? You have absolutely no way how to force the enemies to attack you. They can just ignore you and be Ok...