To be fair… half of the problem here is the shotgun is a piss poor substitute for what it used to be. I understand why 343i made the change. I do not agree with it. In trying to make every gun functionally distinct from the others they were left with only two things they could modify on the shotgun as it is a very simple weapon by design. The damage, and the range.
So they pushed out the range and lowered the damage… which sort of defeats the entire point of the gun existing. It is no longer a power weapon really worthy of fear or respect, and it’s no longer a solid counter to the sword or hammer which was the niche it served in every game after Halo CE. Hell, in Infinite it wouldn’t counter the Hammer regardless because of the size of the AoE damage.
If they pulled in the range of the shotgun and restored its ability to kill in one shot I can all but guarantee this discussion wouldn’t be happening in the first place. In making these changes and artificially creating a problem to be solved 343i pushed players to get creative with the sandbox. I’m not saying that the Mangler wouldn’t have been a powerful weapon in either case… but it certainly wouldn’t be the absolute monster it currently is in CQC because there would be other guns able to contest it.
Right now that space is filled by only the Sword or Hammer, and neither can spawn on a map where the other is present.