It is the quickest way to level , by far.
nice bonus is some gear you can use in PVE also.
10 to 15 minutes, 10-17k xp, vs. riding accross planet for 1/2 hour, get quest, spend another 1/2 hour doing quest, or waiting on a group to do the quest, get 20k xp.
Plus, its true, fighting a dumb AI = not fun.