Doing low lvl roulette for the first time each day is nearly enough to get a full level, after that its the highest dungeon you can do. Tanks and healers get near instant queues, dps can fill in the wait with fates/quests/logs. At 44 Dzemael can do the first big pull to the boss for good xp over and over, but these groups tend to want only AOE dps. At 47 doing the first room of Aurum Vale is great exp as well, I dont know if these always want aoe though, I've only done it once as tank and we pulled one group at a time.