it isnt supposed to be used in a way unlike that, it is supposed to be a long-distance (far enough that you are Hidden regardless of Sneak skill) and a guaranteed crit aimed for the head. So the question is: Why arent you using sneak attack criticals with the sniper?
go through my previous postings and you see why(because i wasted a lot of special points, perks and traits to get a high base crit value, which are all more or less useless and unncessary if i have to rely on sneak attacks) .
other than that, the concept, that a bullet hits an enemy 8 times harder, just because the game flags you as "hidden" is ridiculous BAR.
furthermore, try to stay 'hidden' when using the gobi rifle, you get that one free super hit even a luck 1 melee char would get, and then its over, because to to some magic, the bullets become super weak, if the enemy sees you :banghead: