I miss the separation of Runes and Masteries.
Don't get me wrong; I REALLY enjoy the five trees of Sustain, Burst, Sustain 2, Tankiness and Utility. But I miss choosing what raw stats I'd get! The only way you can get raw stats now is by choosing specific runes that give you specific stats, which means you DON'T choose a different rune that gives you a perk! Why would you prefer dealing an extra 60 damage every 20 seconds if you can simply gain a permanent 48+ AD? Why use Revitalize on the Resolve tree if it forces you to get extra health instead of attack speed? You can just pick up 8% Life Steal on the Precision tree, instead!
They didn't combine Runes and Masteries; they simply make you choose between them, now. I miss having a full extra 22 AD on Darius at level 1! I miss getting an extra 100 AP at level 18 on my mages! And I miss getting 45% Bonus Critical Damage on my ADC's! Complain all you want about how Bonus Critical Damage is garbage, but I got an actual Rioter to admit that it's statistically the best option.
Man, I miss my Bonus Crit Damage. I miss the pre-rework Talon. I miss Lux before her putrid VO! I miss Sword of the Divine! I miss when Titanic Hydra didn't exist! Stop changing things all the damn time!