The Super Soldiers consisted mostly of individuals modified using biotechnology. THey are human, just more advanced. I have yet to fight one, in gaia. I have so far taken alot of different actions, one of the hardest being Night Lords, no they are not vampire. Even though Vampire is just as good as Werewolves.
But night lords; The Chaos Space Marines have the same origins as the Space Marines, thus have the same physical power. Due to their allegiance to Chaos, veteran Chaos Marines can be mutated, thus making them into monsters, faster or otherwise superior. Chaos Marines are also virtually immortal due to the time-warping effects of the Eye of Terror, whereby their millennia of experience afford them levels of mastery with advanced battlefield skills and tactics that younger Space Marines may not yet have.
Think of it this way, if you meet one turn around and run like a girl. Trust me, I didn't die, but iw as so close that, pv2's kill on me, would of looked like a child compared to what they did to me in the fight. I should of saved it and shown, but i didn't and i wished i did. Was the epic of all battles...So far...