I can confirm shotguns are busted. I usually duel wield a corrosive and slag hyperion shotgun against robots, used to be damn effective too, using the titan mod with + gun damage.
shotguns have become far weaker because of the way they changed the buff formula.
everything else works ok, but any multi pellet weapon is gimped now. forget the bee, it's all damage boosts now.
weird weapons still get the boost, like the pitchfork, or harold i believe, but anything that actually lists the pellet count on the card is robbed of damage buffs from all sources. --- Need a simultaneous solution to overpopulation and world hunger? Try Soylent Green. Now that's my kind of people!