A supersoldier needs a few traits. How you achieve them doesn't matter, be it implants, training, technology or even *shudders* magic.
Agility, strength, knowledge, and stamina.
Agility allows for better body control, a soldier can know about every combat technique, but if they can't move for shit they will die in combat.
Strength allows the soldier to be…well…stronger than the opponent. Even if you have know how to best break an enemies neck, you need a certain minimum of force to do it.
Knowledge is power, and if you don't know how to operate a gun, or your enemy, you will die in combat.
Stamina allows the soldier to fight longer. The longer a soldier can fight at max power the more enemies he can take out and the more efficient is his use.
Let's create a super soldier, shall we?
The Kadan Raiders are mercenaries, selling their arms to anyone who has the coin. They Use cybernetic implants to enhance their perception, which allows them to notice an enemy or a projectile far before they reach them and thus allows the mercenaries to react in time.
Constant training and voluntary limb replacement gives the soldiers superhuman strength and stamina, allowing them to fight for days with minimum exhaustion.
Because they begin training and transformation at a very early age, some even being sworn into the cult before or shortly after birth, they spend all their lives training and studying combat and the enemies they might face.
Done.