Do share, why don't you use them? And I'd rather have more specific reason than "I don't like them" (which is a valid reason ofcourse), because I'm curious why don't you like them.
Thank you!
EDIT: Typo, and thank you for feedback. :p
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Because Plan C beats everything, and Ice Breaker is Ice Breaker. Also, limited ammo and range for shotgun makes it meh in PvE. I have my melee ability if things get too tough in close combat.