Samus: Retardedly overpowered bounty hunter who has wrecked the asses of the Space Pirates dozens of times, destroyed multiple hardened military strongpoints, and has a weapon attached to her arm that fires pure energy, electricity, heat, ice, homing missiles, and (according to Metroid Prime 2) a small black hole.
Master Chief: Almost single-handedly took the greatest threat humanity has ever seen (the Covenant) and brought them to their knees. Then, as an encore presentation, wiped out the single greatest threat the galaxy has ever seen. Has energy shields and a reflex-enhancing suit, further improving his already augmented abilities.
Snake: Infiltrates military bases through vents so he doesn't get shot to death by simple guards. Hides in boxes to avoid detection. Signature move: neck-breaker.
Raiden: Same, except he has a vagina.
For further information, look here, and tell me if any human being has any possibility of survival:
http://www.youtube.com/watch?v=lGCcUJzgfwE