Get rid of the shotgun!!! Most of these maps have to many turns, and guardians have to much health to really stop a person turning a corner with a shotgun, and titans lung far when they melee. So your dead before you can even get there health to half. its just -blam!-. You have to stand out in the open to get line of sight on them from a good distance, because shotgun still have crazy range damage. Which leaves you wide open for others.
I don't understand why they didn't leave shotguns in heavy like D1
Tone Deaf*
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Shotguns were special weapons in D1.