Blizzard said it was 10% damage reduction not a portion of resilience.GG inc PVE TRINKETS ONCE again
While not being exactly 10% damage reduction, it's still a rather hefty decrease in damage done to your character. When you consider the amount of damage reduction that the trinkets provide, coupled with the additional ten item levels and the fact that the procs and stats you see on the PvE trinkets don't properly reflect what they do when in a PvP instance, you may feel differently about how powerful these trinkets are.
You have to remember that all of the PvE items will be down-scaled to 496 Ilvl, increasing by one Ilvl per week up to a maximum of 512. So to take for example the PvE trinkets that decrease the duration of six of your major cooldowns; while the number may be reasonably high at first glance, in PvP the decrease is only around 20%. The same goes for the other trinkets which have special procs, all of them have their effects greatly reduced in a PvP instance and as such their effect will not be as major as you may think.
We'll be sure to continue monitoring the state of PvE items in PvP. If we find that a certain item is affecting gameplay in a major way, we’ll make adjustments as we deem them necessary.