According to Destiny Tracker, there are 7 Shotguns (Compass Rose, Matador, Prophet of Doom, Conditional Finality, Deadlock, Someday, Scavenger's Fate) with higher usage than the most-used Fusion Rifle (Plug One). As a whole, the community will never shy away from using what is best, easiest and most consistent - that's why Graviton Lance is top dog right now. No one is going to put on bad weapons so they can appease you on the other team.