Well theoretically yes OG would hinder your fury by disabling the minions, but just jump head first into the spawns and your fury should be taken care of after the alpha 
OG is one of the best powers in the set. Also I don't find that it hurts my fury at all on an Elec/DA. I will say if you can afford it, get the Chance for Endurance proc and slot it in Dark regen. Nothing like getting full health and 90%+ end back in one power.
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I enjoy my EM/DA. Take OG and love it - if your fury is low, you're not fighting enough guys.
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Why MA ratings should be changed from stars to "like" or "dislike"
A better algorithm for ordering MA arcs
I was toying around with mids the other day, thinking up new combos to try, and i found a brute build that piqued my curisoity. An EnergyMelee/Dark. I have not played either set yet, which is something of a guildline i have for myself now a days, not repeating powersets if i've already played them. If they are slightly different and in a different AT, i allow it. Like when i made my BS/SR stalker. i have both a BS/Shield and a Claw/Sr scrapper, but it's a different AT with slightly different powers so i bent my rule....
anyways, back to the topic at head. I'm diggin the idea, already made and tinted my pink pom poms blackish, then it hit me... won't Opressive Gloom hinder my fury building? And if so, how noticable is it? I'm more intrested in survibility on this one, but, a brute without epic smash just feels kind of wrong, youknow?
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My common sense is tingling... ~ Deadpool
If you can't learn to do something well... learn to enjoy doing it poorly...