As the title states, i think blocking in PvP is OP. You can have dmg, and the best protection in the game with the holding of a single button without investing in ways to reduce the cost of block! SNB is the meta atm for stam builds and magicka builds for a reason. You get all the benefits of a dmg build, but none of the risks.
My solution is something that won't hurt pve players, and make it more fair in PvP. I suggest moving a 50% cost addition to block on battle spirit. PVP players are happy because block will have some negative to it, and PVE players wont get nerfed at all. However, block will still be at it's peak if you invest in it! No more full dmg builds that rely on the broken aspect of blocking.