I am leveling a team of 5 RAF right now. End Reward in Blood Furnace+Random dungeon = 53k XP. At level 61 i need 275k. So that around 1/5 of a level. I think when we put the bonus and everything else we should get 1/3 of a level or 1/2 of a level.
Thing is thanks to the new squish or balancing dungeons take longer to finish. And you do die more a lot more. Adequate geared(from the satchels) paladin tank and resto druid simply can't out heal the damage. Some of the bosses or mobs still do the spiked damage that blizzard wished to combat. Overall dungeons are way harder. The days when a resto shaman could use just one spell to heal the tank in a whole pack is over.
P.S. Honestly i would enjoy the current dungeons if i was playing the game and not after efficiency.