Easiest class?

[Shougun]

None of the jobs should be ideally played with 3 buttons but in the general concept of easiest in each role:

Tank - Warrior. Maybe in previous expansions it would have been Paladin but Paladin has maintained some of its niche skills while also gaining some complexity meanwhile Warrior has just generally become a more simple job. So I do not think Paladin is anymore the 'easy' job, though I would still give it credit for it's potential stability (in that you can pull groups through a number of situations due to skills like clemency or cover, both of which fall more into the niche since in a normal regular day you shouldn't have to be using them).

Healer - White Mage. You might be able to even do the 'healing' part of your job with just three buttons for all but some ex and harder content lol. Uhm.. hopefully you're using your other skills though. . . :P.

Melee DPS - Ninja. Unless you have trouble remembering the ninjutsu combos (which are easier to remember if you think about what they end with rather than the whole pattern).

Physical Ranged - Dancer. Pretty straight forward, proc based, get to feel like a bro.

Caster - Red Mage. Just don't cause your job gauge to break :P. Also nice bro moments with raise candy.