Just a few thoughts on the whole Armor Pen issue atm
- Why is it that everyone that complains about Armor Pen also don't understand that Flat Penetration is stronger against squishy targets?
- Why does % Armor Penetration get calculated before Flat Armor Penetration?
- Why do Flat Armor items have % stats? Dusk blade is acceptable, mostly, but we got rid of Maw's attack speed because it was too good of an all around item to buy, and we're seeing a similar problem now in Youmuu's which as of now retains its sizable attack speed buff. Any League mathematician will tell you what happens when you put good Flat stats next to good % stats, and the community as of now is suffering with Youmuu's ease to rush and its synergy to Black Cleaver.
- Duskblade is the item you buy when you need just that extra execution damage to pick off already injured targets. Maw is the item you buy when you need just that extra bit of bulk against Burst Mages. And Youmuu's is the item you buy...just because it offers a lot of stats? I have no qualms with a baseline item that isn't specific to a niche, like Infinity Edge is, but I worry that Youmuu's is in a bad place due to the fact it commonly outclasses Duskblade as a standalone item, and Maw only just competes with it when facing a Magic Damage focused enemy.
- I can't help but feel like the Black Cleaver is a balance crutch in most situations.
- Someone in the crowd is going to hate me for this...but I think we need more Flat Penetration items. Specifically speaking, Assassins as a whole just need more items that they aren't stealing from ADCs
and Fighters 
. Flat Penetration is the best stat to bind to Assassins as the stat is pretty synonymous to an Assassin's job. Furthermore, a complete item pool won't lead to the odd situation now that is Assassins running around with Black Cleaver's % Reduction and Last Whisper's % Pen.
