I leveled every class to 70 using nothing but dungeon runs the entire way through once I hit level 15. I hit 15 doing hunting logs and a few low level FATES. I do that because:

1. I hate POTD and HoH.
2. It helps train your muscle memory for positionals as a melee since you can ignore them in POTD and HoH.
3. They still give lots of experience.
4. During dps queues I work on my gathering/crafting while my tank/healer queues are much faster.