as you can tell (playercard), i have only played 1 game using the brits.
i am bored playing as USF, so i wanted a change.
i wanted to try my hand at the brits. Do the brits have a vanilla mobile indirect fire unit (kat, panzerwerfer, walking stuka, etc), or only via a commander ?
what are the useless (UP) units to avoid, and what units are good to use ?
i just wanna know how to best utilize the brit faction.
or should i go back to playing as soviets ?
Brits core indirect fire is their base HQ. With tommies with the pyrotechniques upgrade or a sniper you can call in barrages anywhere on the map except for command sectors. You can also use the Artillery commander for his global base arty or the Sexton. The emplacements commander can also toggle each base structure to enter counterfire mode where they will automatically barrage any enemy artillery units. (Which is honestly kind of broken right now.) Anvil doctrine and each tier upgrade improve the effectiveness of this barrage.
People will argue all day whether or not this arty is effective. Personally, I like it a lot as area denial. Place it in front of your enemy and they won't be able to walk through it for 20-30 seconds, forcing them to go around or take damage.
Brits are a very unique faction with a myriad of playstyles. However, their units are more like Ostheer than America or Soviets. Tommies cannot fight on the move: they must be in cover to be effective. Sappers and Commandos are great short range troops and both benefit greatly from weapon upgrades and the Vickers is the mG42's bigger brother with passive bonuses to attack range when garrisoned and armour piercing damage with veterancy. The universal carrier has extremely high damageoutput as well and decent armour to small arms fire, making it really strong in the early game. In the mid game it's a great unit to give the command vehicle bonus too and keep near the rest of your army for significant bonuses.
I would recommend honestly just playing with them and trying things for yourself. Decide what units you like and don't like and see if they fit your style. Copying what other people do is bad form.