Humans joined the galactic community after discovering a Prothean data cache on Mars in 2148. Their devotion to understanding and adapting to modern warfare left the staid Council races stunned. Humanity's persistence and unflappable spirit has taken them further than anyone in the galaxy could have imagined.
Alliance soldiers are renowned for their impressive fire support, flexibility, and speed. Humans have quickly integrated new technology into their combat gear and can unleash VIs, drones, and artillery on the battlefield.
Omni-Blade - The Human Soldier produces an omni-blade to stab enemies.
Combat Roll - The Human Soldier rolls to quickly evade incoming attacks.
A Human Soldier can use Adrenaline Rush to not only increase damage inflicted significantly, but also in some cases increase their damage resistance and even give extra shielding.
Frag Grenades are a necessity since they can kill groups of enemies at once, which overcomes the Soldier's biggest weakness - being swamped by weak enemies.
Concussive Shot is a matter of personal choice, but it can lock down single enemies or even groups, if used correctly, as well as acting as a means of setting up detonations such as Fire Explosions, or Tech Bursts.
If you wish to take Concussive shot, the Acolyte makes for a perfect 1-2 combo. The Acolyte will strip every single man-sized opponents shields or barriers in a single shot on Gold, and can even take some away on Platinum, while Concussive shot then knocks said foes onto their backs. If you have a light enough load out to pump out said power every couple of seconds, you can take out all the infantry single-handedly in an extremely quick and efficient fashion, with Adrenaline Rush and a second weapon to deal with all other armored foes.
It's best to take a medium-heavy loadout approach, since Adrenaline Rush can be used quite frequently even with recharge speeds of -50 up to -70%.
If using Concussive Shot, consider a lighter loadout to make sure enemies are continually locked down by Concussive Shot, since you can use it more regularly.
With a low enough weight, a Human Soldier can use a M-76 Revenant with magazine upgrade and Adrenaline Rush to maintain a constant stream of slugs down range. This can allow Human Soldiers to do damage constantly, something no other class or race can do without powers or teammates.
Human Soldiers also have a nice synergy with the N7 Valiant, more apparent with upgrades to weapon damage or the Valiant itself, or use of gear. Even on Gold they can snipe Guardians and Assault Troopers in one shot, although Guardians are a lot more difficult to hit sufficiently. With the ability to fire 6 shots in rapid succession using Adrenaline Rush, a Soldier can kill entire groups of enemies with even greater efficiency than Infiltrators. Salarian Infiltratorshowever are more effective than soldiers for dealing with shielded enemies, although Soldiers can simply shoot twice and deal with any human-sized foe. Because Infiltrators do 105% extra damage with Tactical Cloak and 3 shots, and Soldiers do 70% with up to 10 shots with Adrenaline Rush and reload-cancelling a Soldier can do much more damage per second than an Infiltrator, if their cooldowns are kept as low as possible.
The Cerberus Harrier can be extremely deadly in the hands of a Human Soldier, especially when Adrenaline Rush is maxed out in favour of damage. However, this will mean that the Harrier will burn through its already small ammo reserve in a matter of seconds, necessitating frequent trips to ammo crates. A wise strategy is to save the Harrier for hardened targets like Geth Primes, Banshees, or Atlases, and use a different weapon for weaker foes.
Guardians need to be dealt with using either Armor Piercing Rounds, Piercing Mods, or weapons with base piercing such as the M-98 Widow. Concussive Shot can also knock their shields away, giving you a moment to line up a quick headshot or burst from your weapon.
Guardians can also be killed if a Frag Grenade is tossed into the ground so it bounces behind the Guardian.
Consider using either a fast firing weapon when Phantoms are moving or a powerful weapon (such as a sniper rifle) for headshots when they remain in cover or are stationary.
Atlases can be dealt with in any which way you see fit, but caution should be used since they will usually blow your shields off in just one shot, with your health next if you don't find cover quick.
A good tactic to deal with Atlases is to use Adrenaline Rush to auto-reload a weapon instantaneously — this allows single-shot weapons to do double the damage in a short space of time and for automatic weapons to keep up a continuous stream of fire.
Whether up close or at range, make sure you have at least one anti-armor weapon with you to combat said enemies.
For Banshees and Marauders, consider using an assault rifle or SMG, as these are most effective against their shields/barriers.
Geth are a bit of a nuisance with their Geth Hunters, Rocket Troopers, and Geth Primes constantly stunning you, but none of their units have instant-kill moves, so Soldiers can rest easy knowing they aren't going to get impaled. That being said, the stuns that you are hit with by said enemies can really hurt your effectiveness in combat.
Since every single enemy (Geth Troopers excluded) you encounter has a layer of shields, consider taking an anti-shield weapon such as the Reegar Carbine. The Reegar also fills the close-quarters role in case Hunters or Pyros get too close.
Consider a sniper rifle for longer ranges, for softening the shields of enemies.
Your main strength is your gun skills. Make sure you take a sniper rifle, and a good backup weapon. An assault rifle, or Acolyte will fill the gap nicely. And don't forget to use Adrenaline Rush as this will, as always, be your mainstaying power.
Concussive shot is powerful against barriers, but will only work ideally against Abominations that close in. Troopers and Captains can be affected, but the latter needs their barrier stripped first, and on their own aren't as deadly as Abominations, especially so when said foes are possessed.