Point 1) Perhaps the Hive need to have light to see, same as a Human/Exo/Awoken/Whatthehelleverelsethereis.
Point 2) The Fallen are something of a race of spacefaring pirates. For all intents and purposes, they might be slacking off or something.
Point 3) Perhaps the other tanks are drained/leaked/are some other chemical entirely.
Point 4) The problem with trying to use enemy tech is that nobody in this 'verse besides the enemy quite knows how it works, and it's just as likely to fail spectacularly.
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Point 3 was an example. The issue mostly has to do with how in those types of missions, you're just doing the bare minimum. Point 2: I like that idea.
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Edited by SoullessRaptor: 1/6/2015 3:04:30 PMWell, if we didn't do the bare minimum, we'd risk putting ourselves out a job, now wouldn't we? :P And from now on I'm so imagining those Fallen out by the Hellmouth are all totally wasted. That might explain why they either suck at aiming or have aim assist guns (Shrapnel Shotgun and Shock Rifles)