Aside from agility the hunter gets damage and stealth. Better agility allows you to move more and therefore dodge bullets more or you can call it strafing. Sure, this class wont benifit from getting up in someones face, but what it does benifit from is either not letting the enemy hit you or not letting the enemy know there is something to hit.
English
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"Stealth," if that's what you would like to call it, needs to be in quotations because it's quoting the ability. If you cannot see a cloaked Hunter running around, then you must be blind and then intrigue me because I would like to know how you are playing this game.
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Cloaking is not meant to make you completely invisible its just camoflage and can be used to slow someones reaction to you. Crouching will supposedly take you off the radar.