I think he was meaning that ranged as a whole tends to be a bit easier on average. I do agree with you that MCN is one of the hardest classes in the game, but most of the rest of the ranged classes are pretty darn easy.
BRD: lol one of the easiest classes in the game
RDM: IMO, the easiest class in the game
BLM: Very simple rotation, though punishing if you screw up. This class does require good knowledge of encounters to maximize DPS though
SMN: Somewhat janky rotation, but the class is relatively simple
MCN: Very difficult job due to clunky mechanics and the incredibly ping reliant Wildfire skill
Melee:
DRG: The rotation is very straightforward, but this job has a million oGCD attacks. So many buttons.
NIN: Mudras are still a bit ping reliant and buff timing is incredibly important for TA windows. Add to that all of the support skills and the constant 15% haste buff and this class is probably the hardest melee job.
MNK: A million positionals and 15% haste. Rotation is relatively easy though for what it is worth
SAM: Looks very simple at first glance, but gets incredibly complex to min/max.
So on average, I'd call the ranged classes simpler to play optimally, though MCN is the most difficult ranged class by far IMO.
