Having an ad Carry kill me in 2.43 seconds as a tank does not seem right when i have 200+ armor. I must be the only one who does not like the way armor pen works in this game. My solution would be, remove the armor/magic pen mastery. Nerf 
to 25% pen.
Make 
work with total health and stack with 
add an ap tank tenacity item 
, Revert the 
nerfs and let the True tank meta BEGIN!!!!!
Good thing I'm not in charge of balance
RavenHusky1 votesBuild more health? 
Also, 
is a thing against ADCs.
Lauricella32 votesBuild more health?
Also,
unfortunately 
exists and is meh,
RavenHusky1 votesThat's why you adapt your build to what their team is building.
Critmaster Garen1 votesBuild more health?
Also,
health as a stat has been shit since bork exists. and since they now also changed the passive to apply lifesteal, thornmail isnt very effective either anymore.
there is no real counter build to ad carries anymore.
AyRe CoNteMpT1 votesactually, tanking means having abilities that disables enemies from dealing damage or absorbs incoming damage/cc for your teammates. it doesnt mean standing in full fire for extended durations. and well, if you build specifically to tank only one specific member of the enemy team, you can tank him. but only if you can seperate him beforehand. why if you can seperate him, why wouldnt you want to kill him instead of tanking him?
this means, if you build more than 1 tank item per damage class and no damage, you waste alot of potential of your champion.