El SHarko, if you dive into halo lore, the MJOLNIR armor is so powerful that a normal human who wears it is killed almost instantly. It breaks what ever limb they use and the pain spasm of there body cause other parts of the body to break in a never ending cycle til the body is paste. The alterations done to Spartan 3s and 4s was designed to withstand this and even greater pressure. They are taken at the age of 6 and turned into super soliders by there 16th birthday, THEN augmented. Without the suit MC can lift over 1500 lbs, and can literally flip 5 ton Main Battle tanks in his suit. Sure in the video games MC only has basidc hand to hand combat skills, but in his actual universe, there is no other group of soldiers better at hand to hand combat then the spartans , but you dont need much when you can grab a TANK barrel and twist it in your bare hands.