Much too many players still go in battleground with PvE gear on and they still believe that PvE gear is the way to go in PvP.
Well, bad news, it is not always so! iLevel doesn’t do it for skills anyway, and I can assure you, that in battlegrounds and rated battlegrounds, it is not the case. You will penalize your team by wearing exclusively PvE gear.
There is now, place for a bit of PvE gear in battleground, but very little and even though there is now a base resilience of 65%, some players (for example paladins or any other tank) will have a big advantage in keeping stacking resilience. Now more than ever. Same thing with healers.