No, it's you who doesn't understand GPs weaknesses in teamfights. He's a squishy, immobile MEELE carry - landing your barrels on squishies is almost impossible unless the entire enemy team seriously screws up or you have godlike lockup to help GP set up. His Q flies slower than pretty much every auto in the game so ADCs will pop his barrels before he can blast them most of the time. If you make it so that he can only hurt squishies, which he already has a really hard time reaching and damaging, you're basically making him useless.
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- True damage DoT with massive AD scaling
On a fairly large cooldown unless you pop barrels, plus it got nerfed recently. The damage is also not that large, you'll hardly dent a late-game tank's HP bar with it.
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- Some of the highest single-target damage in the game on a point-and-click ability that has no counterplay
It did that since the beginning of time, is irrelevant to the issue at hand (his barrels), plus he really needs at least 2-3 items before it starts doing damage.
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- A free Mikael's
Every meele carry has a defensive mechanism. Yi has Meditate + his ult, Fiora has Riposte, Tryndamere has his ult... Etc, etc. Not ony that, without oranges GP is basically a sitting duck as any CC will probably lead to him getting burst down. Also irrelevant to his barrels.
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- The ability to do that single-target crit damage in an AoE plus arpen
Barrels can be side-stepped or destroyed. They have plenty of counterplay.
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- A global ult that packs some of the most brutal zone denial and DPS in the game
Can't argue there, but it's an ULTIMATE ability, plus the cooldown isn't exactly small. It's also irrelevant to his barrels.