A DoT can't crit, and therefore it doesn't care about resilience. So what, you ask? Well, this means that as PvP gear improves, and gains more resilience, it protects more against all kinds of damage except DoTs. Which means that, relative to other types of damage, DoTs get buffed as PvP gear improves. Dahis of Shadow Gaming calls this "classist item scaling," and presents as plausible solutions "Either nerf DoT base damage and allow crits, or rework resilience with some flat damage reduction component, or just add some aspect that pertains directly to DoTs." And it looks like Blizzard is listening to the growing concern; in a discussion on resilience, Drysc said "We're looking into it."
So what do you think? Does the DoTs/resilience situation need to be addressed in some way, or is it good as is? For more in-depth analysis, do read the article over at Shadow Gaming, which has several good points.