RDM's need better DPS and a few tweaks. This isn't that hard honestly as we have 90% of what we need arleady, its just poorly implemented. First and foremost we NEED better gear, this isn't optional anymore. Every other hydrid melee job got juiced in the melee gear department, we're still stuck with Dusk era stuff. We have solid Sword / Dagger choices, a good Dagger WS but are severely lacking in the sword WS section. DB should of been more like Swift Blade (three hit 1.5 fTP) and its resistance down effect should of been much stronger. In its current form its ~meh~ and both damage and utility.
Enspells need fixing badly. The Tier II's are useless due to how their accuracy and damage are calculated. My 420 enhancing magic macro is utterly useless on tier II's and is the prime reason I stick with Tier 1s. The fact that Tier 1's scale so poorly with level and gear yet still do better then tier II's just goes to show how SE screwed up. Problem with tier II's resistance down is that you have to use the WRONG element of enspell. To lower a water mobs resistant to lightening you'd have to use ... enwater and thus guarantee single digit damage if you don't outright heal it. The spells should be lowering resistant to the element they are, enthunder II should lower resistance to thunder and so forth. Adjust the damage formula for skill over 300, it shouldn't take 20 skill to raise it 1 point of damage, make it 5 skill and things start to look better.
Once those are taken care of, we can toss in some sort of self-buff "sphere" effect that SE seems to be experimenting with. Make it a series of buffs that effect everyone around the RDM. Fire = +attack, Ice = +MAB, Earth = -PDT, Water = -MDT, Thunder = +crit, Wind = +evd. This would do wonders for the "melee" side of RDM, be easy to implement, not be overpowered, and provide for an actual reason to have a RDM hitting a monster. Lowering its resistance to a specific element, while dealing damage of that element and enhancing the combat abilities of the party members around the RDM.