Here goes, probably gone be hated a bit for saying this.
I have been playing a gen as a dedicated shield breaker. Weapon of choice was "Long Bardiche" (it actually is fun and pretty good all around style).
What I have noticed is that normal shielders with 7 7 5 5 5 builds actually survive amazingly many hits from a 45 cut weapon with shield breaking and 9 power strike.
I'm not saying it is overpowered vs me obviously it is not since I still break them pretty fast, but if it takes me up to 5-8 hits to break a shield they are virtually immune to anything that doesn't have a shield breaker and really high damage number on the weapon.
Now people might actually want the shield mechanics to be that way and then that is all fine and good.
I personally did see shield more to break in 2 to 3 hits with a heavy blow like that. And that good shields should only last for about 10-15 hits from swords.
Please try to not rage too much and write how you see shields for you.