The class you described is what the hunter is suppose to be. The right name for it would be just Engineer or Combat Engineer. Which the abilities would include constructing turrets or something. That would fill the void you are talking about.
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I think of the hunter more as an accurate DPS
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Still we need a engineer class not another stealth like class. Hunter is the stealth class of destiny.
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What can hunters do thats stealthy? But I do agree that an Engineer class would be awesome, I usually spend all of my time as that type of player.