Hell Let Loose is THE best WW2 game I have played, it's less hardcore than a game such as Post Scriptum and therefore is enjoyable for casual gamers but is challenging enough to satisfy Hardcore players.
If you want to win in this game you must work together, this means running with your squad, listening to your Squad Leader and communicating often, lone wolfs generally have a lower overall score than someone who plays with his squad, kills do not count for many points but are satisfying nonetheless, especially the *tink* sound of headshots.

Before you start your HLL experience make sure you have a functioning microphone, communication wins games and you don't want to be having to stop every 10 seconds to type something.

Building "garrisons" in this game is super important, they are the static point at which your entire team can spawn at, they require a Squad Leader and a support player to build, the support drops "supplies" and the SL builds the "garri".
Each Squad Leader can also build an 'Outpost or OP', this is a mini garrison that only your squad can deploy on.
Enemy garrisons can be destroyed by blowing them up with bazooka/panzerschrek/tank rounds or just dismantling them manually. Removing an enemy garrison is very important because they can only be built every 200m and thus giving your team greater map control.

You can either play as Infantry, Armour, Recon or Commander.

Infantry is the main source of aggression and defence in the game, they push the objectives, protect your tanks and cap points while also defending positions while other squads attack the point. You are awarded points when you are in enemy and friendly territory so staying back and defending captured positions nets you just as much points as attacking while also allowing you to have the defenders advantage of the enemy pushing right infront of your gun.

My personal favourite is Armor, you play as a 3 man squad (Driver, Gunner and Spotter) it is your task to eliminate enemy tanks and support the infantry, it is adrenaline filled fun and hugely exciting.

The driver role is much more than just "driving" you need to listen to your spotter who will be telling you where to position the vehicle and you also have a hull MG for infantry suppression, it is your responsibility to keep your frontal armor facing the enemy.

The gunner is more self evident; you shoot things, but it also takes skill and patience to place a shot from 700m+ and hit the right spot to do the most damage, especially if you are outgunned by a heavier tank.

Lastly the spotter, this position is very important, you have a periscope which enables you to see the enemy from long ranges, this means you may be telling your gunner to shoot somewhere so far away he/she cannot see the target and are relying on you to use the marking system (called pinging) to see targets. The driver also relies on you to help find a path through the countryside because he only has a small window slit to see through, so again, communication is key.
You are in overall charge of the tank and it is recommended you play the "Tank Commander" role from the Spotter position so you can mark targets swiftly and communicate with other leaders effectively.

Tanks on the German side are the Puma Armored Car(50mm), Luchs light tank, (armed with 20mm autocannon) Panther medium tank (very mobile but hard hitting medium tank with a 75mm gun) and the Heavy Tiger tank (slow and methodical beast with it's massive 88mm gun)

Tanks on the Allied/Soviet Side are the Greyhound armored car (37mm gun), Stuart Light tank (37mm) the 75mm and 76mm Sherman Jumbo's, BA-10 recon car, T-34/76 and IS-1 Heavy tank.

The recon role is a two man team consisting of a Spotter (binoculars) and a sniper who has either a 4x scope (Americans, Soviet) or a 8x scope (Germans). While there is a massive difference in zoom between the two scopes, the smaller zoom on the American/Soviet rifle allows for quicker and more aggressive up close play (100m-250m) while the german scope is cumbersome therefore encourages you to finding a nice position and picking the enemy off from 250m-500m. Recon is responsible for either helping your team push by taking out high value targets such as MG's, officers or other Recon Squads but can also slip behind the lines and destroy enemy garrisons and resource nodes (more on those later).
Unlike regular Squads which can only place their OP two "red squares" back, recon can place theirs anywhere which enables deep flanks and stealth missions.



The Squad Leader role.
Playing the SL role is rewarding but does come with a lot of responsibility, your 6 man squad is relying on you to make informed and quick decisions on a tactical level, i.e. Do you move to the exposed flank and hold it from a vantage point such as a farmhouse and prevent the enemy from streaming through, or do you be more aggressive and try to flank yourself while having to worry about your comrades being hit from that exposed flank?
At first it can be a bit overwhelming (you have Command chat and squad chat in your ears). I would suggest you try the other roles (especially the Support role) before you attempt to play as an SL. The key to this role is communication, patience and also making snap decisions as well as taking advice from other squad members. Your main role is to push the points with your squad, flank the enemy, mark enemy movement on the map, build garrisons to support the push and communicate with other SL's and the Commander constantly, all while under fire and trying to figure out where the enemy are.


The Commander role.
The Commander is responsible for major Strategic decisions and influencing the flow of battle. The role can be played in a few different ways, some prefer to get down and dirty building defensive or offensive garrisons and being closer to the front line, whereas others prefer to sit further back and direct traffic from their map (more like an RTS game) and micromanage.

For the Commander to be effective he/she needs resources, and the only way to acquire them is for SL's to have 2 members of their squad (support for the supplies, and an engineer to build) build " nodes", these consist of munitions, manpower and fuel.
Munitions are used for artillery and anti-tank gun shells as well as enabling the Commander to drop "supplies" on a chosen position (as well as other abilities). SL's and their Squads can use these supplies to build nodes, garrisons or just to fortify a chosen area (engineers can build bunkers etc with supplies, anti-tank can build AT-guns). Manpower enables the Commander to use specific offensive/defensive abilities while fuel allows the Commander to spawn in tanks, and recon vehicles.

Naturally, if the Commander has no resources because players have not built nodes they cannot do these things, and as anyone who has played an RTS knows, No resources= no win.
It is highly advisable that you DO NOT play Commander until you are very comfortable playing the SL role, because it is much more nuanced and does require you to be a stingy bugger, you need to make hard decisions and prepare to take the blame if it back fires in your face.
You need to delegate tactical responsibility to the SL's via the command channel, and focus on the greater strategical picture. My advice is to be firm but not a tyrant, every SL will be telling you "we need supplies here" or "we need a bombing run here", it is up to you to decide whether they actually need those things or if they could be better put to good use and send them another squad to help out instead.

You can also earn XP (and support your team) by driving supply trucks to and from the front line laden with supplies for the engineers.

This turned out to be a mammoth review and I hope it helps anyone who was sitting on the fence about buying the game, it is 100% worth it and the community (Germany at least) is very welcoming and helpful.
Enjoy!