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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You practically have to stick the barrel down something's throat to be a threat to it. And while you're trying to do that, you're gonna get clobbered by any enemy that matters. Meanwhile, snipers wreck stuff, absolutely wreck stuff from med-long range, and fusion do the same from short-mid range. There's no "niche" that a shotgun fills that Snipes/Fusions don't do 10x better, while allowing the user to stay out of melee range of the target.