Outland greens are actually as low as level 57, if I am remembering correctly.

Those early quests help a lot with gearing up for instancing. Also, I don't know if this is due to my becoming more familiar and comfortable with my multiboxing setup, but once everyone in the group was level 61, Ramps became a heck of a lot easier (well, except for the final boss). I am not sure if there's a big leap in character power from 60 to 61 or if it just coincided with my becoming better at the keybind shuffle.