well, just like @anon40195310 said the Flamethrower Squad 2nd class type it’s better due to increased range and perks.
it’s hard to suggest something with the first one, but nonetheless it can be used.
my suggestions as i have the flame trooper squad active in my line up, try to get the other specialization as well.
what makes the flame trooper squad special in my opinion, it’s the available options in the tech tree.
one of the best attacker squad in my opinion that can be used for defense as well.
and even better, you can have two flame trooper squads with the use of the 2nd flame trooper ( although you will have to grind them ) but with different loadouts in terms of specialization.
after that technical aspect, speaking for gameplay,
flamethrowers are a bit under-powered in terms of damage.
so you have to use your brain to use it " correctly ".
which from here, i correct my self. because there isn’t a correct way as long you deal damage, or even just deny areas of entrances ( such as bunkers or houses ) and from there, it’s all gain.
little tricks such as use the " bounce " feature can help you to reach enemies behind corners or usually outside your line of sight.
if you have someone above you, start ignite the roof, 80% of the roofs in enlisted can be ignited and kill whoever is above ( this works mostly for normandy though… ) it’s the easy way to deal with threads inside buildings. but mind for the backfire as it can easily bounce and hit you.
due to the range issue of the first flameweapon, don’t use it hoping to cover your self behind flames. this only works in close quarter against players.
otherwise use your primary weapon ( which would be best if it’s a bolt action. due to not being able to carry ammo pouches ) you can have the engy in your squad ( which it’s always useful and evergreen in most occasions ) but it’s not mandatory if you wish to carry other classes. plus, the bolt action rifle has enough ammonutions to usually deal with whatever you encounter from the distance and to finish the closer enemies with the flamethrower.
if you have alot of issues with distances and " hide " your self, your best friends are going to be smokes. equip them to your flametrooper and use them whenever you think is needed to close-in around objective.
and as stated above, close quarter is where flametrooper shines ( no shit ) as such, if you hear gunshot or see enemy, always try to prefire them. chances are, they get ignited first and might not be able to return fire if you expose your self less as you can.
and lastly, ( although doesn’t always works, and requires alot of ammunitions, ) you can kill tanks with it.
try for the engine. but it’s unconsistent. so i don’t really know if consider this option when TNTs are much faster and relayable. ( works great against open top vehicles though )
and that is all. if you have further questions, just ask.