I am going to copy what someone else said regarding drg difficulty

1.NIN combos are all 1-2-(345) while MNK is completely free flowing and SAM also has overlapped combos of 1-2-(34) and 1-5. All melee have a dot to maintain and debuffs as well, but DRG is the only one of them that has two unique three-step combos (5-step) to get to their damage actions. rather than making one decision for the current gcd every now and then, you\\\\'re making decisions for five gcds in the future every time you start a combo. That requires more forethought than any other melee dps just on gcds.