Depending on the class dodging makes you insanely hard to hit. It could make you invisible, you could get your melee ability, or you reload your weapons.
Dodging is meant to give you small buffs during combat.
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Reloading my weapons or recharging my melee don't feel like super useful abilities. I tend to use Arcstrider, and I think it gives me some kind of damage resistance while I'm rolling, but that's a couple-second buff that hasn't saved me very often. It feels kinda crap compared to the ability to throw down a circle that buffs and aids allies, or throw down a shield that could protect us from fire, or eliminate the need to reload while nearby it.