Leave the beast tribes alone. Here's what leveling as a DPS on my server looks like:

Alliance roulette: 5-10 minute wait, lots of exp.
Beast tribes: 200kish exp, 3 a day. 100kish exp for 3.0 ones.
Leveling roulette: 25-30 minute wait.
Highest level dungeon: 25-30 minute wait.
PvP: 20-25 minute wait for much less exp than a dungeon.
PotD: < 5 minutes, but terrible exp above 60.
Leves: HAHAHAHAHA, nope! There aren't any 4.0 combat leves because we wouldn't want DPS jobs to have a way of getting exp while sitting in ridiculous queues.

So, with long queues, I'll keep the beast tribe quests.