Seems like there is an issue with the hunters speed. I cannot move as fast even with a light weapon, 100 mobility, stompees and a speed boosting subclass but on a titan i just put on a dunemarchers and i'm golden. And when you take into account that how fast you move in destiny 2 is mostly determined not by how fast you sprint but by how fast you fly through the air, then hunter is just too slow.
Another issue is the hunters dodging speed for the gamblers dodge ability. How many times have you've seen a dangerous situation, dodge to get out of the way and died because of the slow animation of the dodge. This is a problem since the purpose of this ability is to get out of sticky situations.
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You can most definitely move fast as a hunter. All you have to do is time your jumps. Dodge speed is fine.