I play a SPriest and Mage and cannot tell you how many times I have had a kid in 344 ILvl bitch and moan at me for wearing pvp gear, which often leads to getting kicked.
The simple fact is that if you pull your rotation in 364 Avg ILvl pvp gear and pull the same rotation in 346 Pve gear, you will come out almost exactly the same.
If I pull my 15-16k dps, whats the difference to you. You should be thankful that I already have most of the pvp pieces and won't be needing on yours in BH.
I generally don't care about PVE that much, but being able to switch over to it now and again when pvp gets frustrating/old/boring is nice, and to be so limited by morons that still rely on ilvl is annoying.
TL: DR PVP gear does not = bad dps. Bad players=bad dps, they deserve to be kicked/held from loot, not people in pvp gear.