I have it and I have to say it is quite effective at times. He does have a point it can be superior to all Rocket Launchers in quite a few encounters/situations. Take Vault of Glass for example it can be used effectively at the Templar and Atheon Battles. For the Templar you can have everyone one stay up top with Icebreakers and Dragons Breath, while the Relic Holder hops down you pass the first Oracle and once the Relic Holder takes down his shield everyone fires upon him with the AOE Damage draining his health extremely fast the Relic Holder stops the Templar from moving away and if done right it can be destroyed in less than 2 minutes, easy right? Take Atheon for another example while the Times Vengance is active everyone jumps up just enough to fire a rocket at him and he rarely moves and he can also be dead in the first to second Relic....
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just don't aim it center mass, so people who might be sniping can see the sweet spot. i used a DB on him before but he moved away from the flare, so it's not super useful once he starts moving around (after a few seconds of taking fire from a raid team)