It only works if the enemy team doesn't have insane escape aka khazix, zed, etc etc, but mid game it starts to pick up and by late game he does well.

You will mostly be relying on hammer stance to get the job done because cannon Jayce falls over too easily and is on cooldown for 14 seconds every shot.

Atma's Impailer is a pretty decent item for an offensive semi-hp tank. Most champs at level 18 have around 2k hp which equates to 30 AD off the bat, or 1 AD per 66.666... hp

2300g
45 Armor
15% Crit Chance
30 AD

Most bruisers tend to have around 3200 hp which gives them 48 AD.

You get around 81 AD on a fully built hp-focused Mundo