Permanent warmode on Ysharj gives a flat 15% XP bonus to quests and mobs outside dungeons. XP from dungeons hasn't been adjusted to compensate. On top of the low population and general difficulties that come with group content, this disincentivizes people who would like to heal and tank from taking those roles up.
One place to look is the consensus on leveling a priest at the moment. Mobbing and questing feel painful, as opposed to a rogue or shaman, where the best XP gain over time feels actually manageable.
What I'd like to push is a 1.15x to 1.25x buff to mob XP in group content, assuming one is grouped. I understand a fine line has to be ridden to keep a handle on dungeon cleave boosting. I still think having more paths for progression is both objectively good and falls in line with the design goal of the PvP gear.
( Also, for the love of god, reverse the nerf on XP in low-lvl bgs. It's killed any wsg bracket below 60 for the most part )
TL:DR - 1.15x - 1.25x xp boost in dungeons when grouped