Sorry I should taken into consideration foreign barriers that is my ignorance but Spartans react quicker than you can see and you wouldn't even need to stop a Titans super as for damage spartan mjolnir armor is made of a titanium battle allow designed to deflect explosion and stop thousand degree plasma. Then they have a shield that can absorb a rocket fired from a space interceptor. A even team of guardians vs spartan would not be a close match spartan can dodge bullets and be so quiet as to not be heard in half combat armor not to mention the weapons Spartans utilized shot high caliber armor piercing rounds at 15 rounds a second essentially filling the air with bullets not to mention any of their other gear like 110 mm rockets or thé energy sword which can cut through starship plating

Guardians = undead Spartans with better gear and ability's/ weapon's. I'm guessing you don't know much about guardians do you? Honestly we don't know enough about them to accurately make these estimates. But they were in fact chosen to be resurrected because they are the strongest heroes that humanity had to offer. So it is right to assume that they are as good as spartans. However it is not right to be so ignorant and to just assume who would win or loose bases off of poor facts like you have been doing. Sorry that you know a lot about Spartans but know nothing about guardians.