FATE grinding might be faster.
But still did naught but Dungeons from 15 - 50 on my Warrior.
I made damned sure i knew what the hell i was doing by the time i was 50.

And crap XP from dungeons? Uhhh .... up to Haukke Manor, i was getting 500 - 1k per trash mob kill, and from Stone Vigil and up i was getting 1.5k per kill of each individual trash mob, 8 - 11k per boss, then another 10 - 12k from the newbie bonus, And 400+ gil from that same bonus.

All that for 35 - 45 minutes of cruising through a dungeon chatting to random players about random things, meeting new people on every run.

How in the hells could that kind of XP be considered *bad*?!