Heyo, some quick points.

BRDs are the lowest max damage job given a nigh standstill fight. High burst though, and mobility and silence. And songs!

DRGs are the class most hindered by being unable to backstab (iirc every fight can be flanked, so that should not be an issue). They are also the least forgiving if you mess up the rotation, or miss an attack. Requires probably the most planning of any class. However, essentially 0 RNG.

MNK are easier than DRG for optimal dps. They are, however, more hurt by boss disconnects. Also have terrible, terrible ramp up times (30-40 seconds w/o PB), but should have the highest single target dps. Again, 0 RNG here, its all planning.

BLM have ridiculous AoE, are unconstrained by resource, and have some nice survivability cooldowns. Rooted in place for 90% of casts though. Proc dependent. How you deal with them I suppose is the measure of BLM skill.

SMN have high sustained dps that is only minorly impacted by movement and target switching. Takes a bit to ramp up (though lower than you would think). Pet management is important though.