Instead of nerfing the shotgun and fusion rifle in the crucible, they should increase the scarcity of special ammo to near equality of heavy ammo. Less special ammo would mean more reliability on your primary weapon, and in my opinion, would give the crucible a more balanced experience.
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I can agree with this. In Halo, shotguns, snipers and ..spartan lasers (a stretch i know) were pick up weapons and were rare because of their power. I'd also accept the idea that you start with no ammo, like heavy weapons, but the drop rate of special ammo is still higher than heavy.