You're not the one ruining it. The developer on the other hand is by making PVP gear on par with PVE gear, or better than PVE gear.
PVP gear shouldn't be a valid option for fast entry into the hardmodes. Getting into hardmode should require some PVE dedication.
PVP gear should have primary stats lowered to the point where it's worthless in hardmodes, just keep the PVP stats as they are,, that way people will have to acquire proper PVE gear before doing hardmodes, like normal people do.
As i said though, that's not your fault, it's the developer's fault for not thinking ahead, nor clearly enough when making the stats on the PVP gear.
PvP gear, while great for PvP should be more than usable in HM FPs and story mode OPs. It allows players access to most of the game without having to completely gear out in two sets of gear. It's better for the community and better for the game as a whole.
We had the same problems with people like you in WoW. You wanted PvP gear completely unusable in PvE. It's was absurd. The game is meant for everyone. Maybe the gear isn't optimal but nothing except hard mode ops and nightmare ops require optimal gear.