It seems odd that each enemy faction has a decently fleshed out arsenal, yet, aside from some stylized exotics, we can't use any of them.
Imagine equipping the Vex torch hammer or Fallen shrapnel launcher as heavy weapons, using the wire rifle or shock pistols.
Seems like a real missed opportunity.just
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Better yet, why are the guardian weapons mostly bullets and shells, and the aliens have guns that shoot corkscrew bullets, flaming pellets and high velocity energy rounds? "Aw man! That walking, talking, über intelligent sentient machine just winged me with an energy round after time/space traveling from across the universe to get to me! Good thing I had my trusty pump action, single fire, future shotgun!" Really why are shotguns even still a thing in the future? I mean, no guardian ever said "Hey, -blam!- Banshee, let's pick up these slap rifles and just use them guys!"