I've never really played any of the games in the series at all. They've always looked good but just never got into them really.
Yeah, I've heard you almost have to stick with mostly the main story quests for your first class otherwise you'll have no content to level up the other jobs. I do think it's kind of awesome that you can do everything on a single character though and don't need to make alts. I could see it taking forever to master everything.