[Gogan]

I've only played a few classes: 50 Conjurer, 50 Thaumaturge, 43 Arcanist, 15 Archer (Black Mage, White Mage, Summoner, Scholar). Haven't touched the melee classes yet.

Conjurer was boring to dps with. The first 15 levels until you can start healing in dungeons are slow.

I hear the Bard is basically a 1 button job, so that could be boring.

I don't think there are any "bad" classes or jobs, though. They all have their strengths/weaknesses/utility in groups. Of course the nice thing about the game is it's really easy to switch between classes and jobs to find something you like.