From a Tanks perspective.
Summoner is my favorite DPS job assuming nothing needs to be slept. Sharing DoT's across things does not build up aggro very fast, so it's very easy to tank for you.
Black Mage is my second favorite DPS job. You have Sleep (and some of you even use it). You have very nice spike damage and will not sputter out in a fight.
Bard is my THIRD favorite DPS job. Spike Damage is great (let me have more than 1 action before you blow your load). Limit Break is useless in 4 man content.
Monk / Dragoon are tied at the end. Stun skill, and Single Target LB are really the only things I'm happy with here.
From a DPS perspective.
I love that Bard doesn't have cast times. That's why I leveled it, even if it was low on the totem pole for damage I can be mobile while I DPS.
I like the idea BLM has strong support with being able to sleep targets, and that I never have to worry about running out of MP.
I don't like playing Summoner, trying to keep focused to keep DOTs up when things just die quickly makes me feel useless even if the damage ticks away.
I don't like Monk/Dragoon the attack range is too small so if things fidget I can't hit them and most of my combo's are only average unless I'm running in circles around the enemy.
