Gjallarhorn "feels" more powerful than it is. It's something like 1.5-1.75x another RL. The way people talk about you you'd think it was an order of magnitude above the competition. He totally has a point.
Thorn, at launch, was capable of a double tap and ridiculous kills. It didn't feel powerful. The numbers and spreadsheets were there. Theoretical TTK for a double tap was the same then as it is now: 0.36s (it'll take longer for them to actually die but they'll be living dead waiting for DoT to finish them off).
I wouldn't go as far as they did, but community perception on a weapon's worth is often not that objective. 4th Horseman is not correctly recognized as the absolute king of burst DPS. Word of Crota got a ton of shit as being worthless. It's higher DPS than Fatebringer unless you're killing a mob of Thralls via Firefly. Atheon's Epilogue is still, and likely always will be, the fastest primary against Oracles. Objective analysis notwithstanding, the community talks about Unflinching Hand as absolutely essential when it's absolutely marginal and useful only at a fairly high level of play (reticle will move about 35% less but take the same time to return to the original alignment, this is not noticeable when hard scoping but very much so while drag scoping, depends on player and play style) whatever i digress. Corrective Measure is a regular, average Machine Gun. Sold by a vendor nobody would have held on to it. Still seen as essential despite the numbers. The Devil You Know is a regular ass hand cannon and people still regret deleting it. Low impact Hand Cannons (Word of Crota archetype) have better TTK than Fatebringer/Red Hand IX archetype, but nobody uses them. Best machine gun in PvP? It's green. Xerxes-C with Aggressive Ballistics + Focus Fire. Count with one hand how many times you've been killed by it. Meanwhile some guys still rock Hunger of Crota in Crucible despite no proximity and low ammo count.
They overstated the power of sound effects. But to suggest this is an Eve Online-style community that follows the spreadsheets objectively ignores the fact that cool factor and personal preferences go a super long way here.