No offense, but that video you made doesn't really mean anything. Every kill you got in it was either someone standing still or moving straight towards you, both situations where it's easy to get kills with any fusion rifle. I'm sure that this fusion rifle is better than most others, but in an average crucible game where people are jumping around/sliding/hiding behind cover, fusion rifles are not the best option overall.
It's clear you weren't really watching, that's okay. It's okay to be wrong. The video shows off the fast charge rate and the amount of rounds in the battery, situations where you'd die if you used a primary (too slow) or a shotgun (too far away), and situations where you'd die if you hesitated and switched weapons.