I am still low level but here is what I feel I would change if I was designing the game.
Gladiator/Paladin
Move Flash to it's own cool down counter so it can be weaved in between each step of your attack and make it so that it doesn't break a combo chain. Than change the additional effect to be dependent on your stance, if in Sword oath let it do some damage, in Shield Oath let it Blind. Enhanced Flash should up the enmity generated.

Possibly have Sword Oath increase the rate of Auto attack as well as the damage (Only just got my Paladin class so haven't had much time to play with this skill yet. Though the attack does feel slow for the damage it does without the stance on.)

Marauder/Warrior
Change from Pugilist as the second subclass to Lancer. Than maybe add a chance to Dodge to Enhanced Foresight. Or leave it as Pugilist and add a boosted chance to Parry to Enhanced Foresight. Though the reason I think Lancer would be better is that would allow me to use Feint slowing the targets attack and letting the Dragoon focus on Damage since we don't have the ability to stun lock; ok and I won't lie Invigorate would be nice too and keep me from having to go on conserve mode with TP in a few fights I have done so far.

Have Overload stay as a cone damage but allow them to generate enmity in a circle. This would allow the need to cross class Flash to end, though lowering the damage and moving it to the global cooldown would be really nice as well with this change letting it replace flash.