The difference is TIMING
Hunter dodge recharges twice as fast as Titan barrier.
Titan barrier recharges twice as fast as Warlock rift.
Why should Hunter dodge be at the same level as Warlock rift?
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A useless low-utility ability can charge 10x as fast, but it'll still remain a useless low-utility ability. Generally the only time a dodge roll can provide defensive utility is when you're around a corner and it lets you get to cover. In PvP especially, unless you're next to a corner, it won't be of much assistance. And like I said, it has 0 utility for your allies unlike the warlock rift or the titan shield. That makes hunters the only class to have a low utility class ability, regardless of how slow or fast it charges.