While Abyssea and ToTM have been great additions to our melee potential, it hasn't really opened the option in all areas. There are several things that are the cause of such. Honestly the rdm melee role isn't seen as effective due to alot of aspects of the job, playing the role players want you will be constantly forced to stop and cast.

My foremost concern is the lack of gear as our level increases, the few we get are rare and shared by multiple jobs that in most cases, could use the item better. due to such most items are in high demand and most LSes won't give up a piece of gear like that unless you have a DD job leveled. Other options are Augmented items such as the original add-on items and Mage pieces that we get that are lucky enough to have some boost to our melee abilities such as haste. Then of course theres older items such as dusk, rdm is one of the only jobs that can melee that still need dusk for a decent haste set, most other jobs that can use it have other options or only use it cause there lucky enough to have HQ.

In terms of Weapon Skills, while we lack sword Weapon Skills we still get most decent dagger WSes, excluding Dancing Edge sadly, Also keep in mind our best dagger atm is twilight knife, another high demand multi-job item. As for our swords, we have alot more options in terms of weapons, but lack in the Weapon Skill department our best WS by far is Death Blossom which while still being a good weapon skill, lacks the crit bonus of Vorpal Blade, due to such it can't take full advantage of Razed Ruins Like Vorpal, CDC, and for the dagger users Evisceration can. Sangune Blade is also a decent option due to our natural MAB and high INT as well as gear, something which most jobs that have access to the WS don't have, The worst part about it, is the fact that in order to access those Weapon Skills we must sub one of the jobs able to use it, Which means we cannot use /dnc or /nin, losing dual wield and lowering our damage output, as well as losing the additional support options that /dnc provides.

While composure was actually a nice boost to melee, it allows use to cap our accuracy easier, it does nothing for our other stats, most light DDs have some Job Abilities or Traits that give them the boost in dmg to allow them to more easily keep up with the high damage of two-handed weapons, thf has Sneak Attack and Trick Attack, blu has its spells, dnc has flourishes and in some cases steps and Sambas, nin, and dnc also have high levels of dual wield allowing to attack at a much quicker rate with two one handed weapons, mnk also has a similar aspect in the form of Martial Arts for its Hand-to-hand skill, ontop of that these jobs also get access to more haste gear, dex gear, crit rate and crit dmg gear then rdm, rdm has enspells but in most cases its not a high enough boost to be considered, and even with composure, we have to consistently re-cast it.