Funny how mostly rate based on inexperience and opinion.

As all 50's i90 +,
1) Monks have the hardest rotation as it is extremely customizable which can cause a simple screw up for bad dps. Lost of GL mean 30 sec trying to get it back. And if you get GL 2 then need that last positional skill to hit but the boss moves or disappears for X amount of time... you lose it all. And dont forget the dots.. building GL 3 and working about dots.. come on...

2) Summoner, my raid job, is not as difficult as monk as getting DOTS up is easy. However, micromanaging Garuda or Ifrit is a task in itself. In between dots, I have to make sure pet is in proper position, either in obey or sic depending on the phase, and getting their buffs up as much as possible.. that only within 18 secs.

3) Dragoon, not complicated at all as you only have a 3 chain attack compare to Monks 9. You screw up, oh well. that only 6-9 sec recovery. However, its also a dot class, so you have to make sure dots up and getting max dps with positioning. I still think the jump animations are a hinder to DPS, even after the fix.

4) Black Mage, the rotation is 1,2,3,1,2,3... nothing special about it. No mana consideration other than how you convert from Astral to Umbral (Convert, Transpose, Blizzard 3). The only thing that make this job hard.. you cant move. While, Monk and Dragoon constantly having to dodge AoEs either from boss or raid, the Black Mage have to only worry about raid AoE. Deal with it really.. Scathe, swiftcast, surecast, manawall, manaward, Aetherial Manipulation, even thunder and fire 3 procs...

5) Bard, my actual main, why... cause it easy. Why learn new content while struggling to keep up DPS? Anyways, seriously Heavy Shot all day. Dots are easy to keep up.