Balance needs to be more like Rock Paper Scissors
Another person brought up a VERY good point in another thread. Right now, tanks are basically useless.
Itemization makes it so easy to melt someone with 400 armor and mr, who is also doing no damage at all. Some examples:
Full damage 
vs Full tank 
. Lucian wins hands down leaving with full hp.
Full damage 
vs Full tank 
. If Zed waits for Leona to blow cc before he ults, he will win easily every time.
Full damage 
vs HYBRID damage/tanky . Leona can cc the Vayne, with enough tankiness to survive her damage, but also can damage her and potentially win a fight.
Right now Tanks lose pretty much every time in fights. There are so many options for penetration (including a certain %hp item 
with makes tanks get destroyed and also do no damage. So basically full damage just wins fight (assuming that in soloQ there is always a decent chance, specifically in lower elo, that your team will not follow up on a tank's engage).
Instead, as another pointed out in a thread, it should be more around a Roshambo.
Tanks 
should be able to survive burst based champions such as 
and 
.
ADC and DPS 
champions should be able to defeat tanks .
And burst champions 
should be able to kill adc's and DPS champions.
This way, EVERY role has its perks. Not just, pick burst or ADC/DPS and kill everyone. Meanwhile tanks always get melted whether it's by burst or DPS.
