Playing with daggers, every enemy with shields can instantly block every second hit I give them, is this as intended?
I mean, we have stamina to limit how much we can attack consecutively, I believe we can add a little more flinch to enemies when we hit them in general
Based on my own experience, I would say functioning as intended.
What I do is dash behind them to effectively get them off balance. I can get one hit it > parry > few hits > restart that loop.
You also have to explore other combat techniques, such as parrying, dodging [aggressively], and charged attacks.
do charged attacks do anything different? I tried then but noticed nothing… 
I normally play ARPG with colossal weapons, specially with charge attacks, they usually are slow but one shot everything, and this game works differently. Enemies take up to 3 or 4 charged attacks of a two-handed sword… and the diference in damage was so small compared to a normal attack that I never use then
Try dual daggers and see if you can do a normal 2hits attack to shields.
My solution for now is backstab.