Ironclad Armor is pretty amazing. For those that don't know, the Ironclad Armor is the turtle shell armor, which prevents backstabs. In PvP, you can basically just backstab and parry fish with little consequence. They're whiff punishes have to be something other than a backstab. And if you're wearing Ironclad Armor, chances are you have high VIT and have good heavy armor to complement it. Meaning, you can tank hits for days and you don't have to worry about much of anything.
I've been trying it out on my tank build, and you can parry fish pretty consistently. You can tank hits then parry. If you mistime the parry... you just tank the hits. The only thing you have to really worry about is them parrying you, which is unlikely if you're just fishing parries and backstabs.
I'm really having success with my Juggernaut build. I can space, tank hits, do crazy one hit damage, and have very little to worry about. The only thing I have to worry about is bleed damage, poison, and other elemental stuff. Although I'm getting good damage in, I'm still not set on a weapon for this build. I was using the standard Battle Axe, but it's pretty awful in PvP. Switched to the Mastadon Halberd, which does a lot of damage and has the spin to win move. I'm not too far in the playthrough so my weapon options are limited. I just wanted to get to a decent level to try out some PvP stuff, and man I'm surprised at how well this build is doing. It took waaay too long to get the Ironclad Armor though. I literally killed 230 Ironclad Soldiers before one of them finally dropped the chest piece. Really frustrating considering I had to waste 2 Aesthetics and they were pretty hard to kill at NG+ level while I was only a level 90.
Anyway, eventhough I'm still not in love with the PvP or the netcode for PvP, having fun testing new builds and strats out. I've played a few people who are naked and man, those rolls are so far with no armor on. The hatemail is strong too, not many people are as in love with the Ironclad Armor as I am... it seems. One guy even called me a hacker, seemed more like a complement to me.