See you're wrong there, sorry to point that out.
In your subclass there are perks that state "felled by your fire" see, your melee and 2/3 of your grenades all use fire or have a burning effect, yet you never use those perks? That's your choice, you can make your subclass revolve around the super, or you can swap talents around have have something other than your super to deal damage or change the playstyle
Melee someone of kill them with a flame grenade and it leaves a sunspot on top of a control point? Go stand on the control point and now you have an over shield and your capping it? See, that's useful as shit. But I guess op hammer spam is easier than thinking.
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See, that is a single perk that doesn't go into the Super and it still counts toward it. Try again.
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Thermal vent and fire keeper, a combo that will do what I just said, oh it helps the super as well? That's a bonus. Try again at reading your subclass yeah?