Guardians wouldn't stand a chance. Spartans have enhanced hearing, enhanced cardiovascular systems, reinforced bones, reinforced muscle, enhanced vision, superhuman speed... And then they put on the armor. Spartans can run over 70 kilometers an hour while wearing a 2 ton suit of reflective titanium enriched armor. The armor also has adrenaline boosters which inject the spartan with so much adrenaline the world seems to move at half speed. They're also master tacticians and can solve string theory in their heads. Sorry guardians. I dont know why we did this to you all.