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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With the exception of Thralls, all of Destiny's enemies are capable of attacking at range and the shot gun has none. It is more tactically effective to eliminate threats before they get to close get within shotgun range.