(3/3)
The Medic is extremely nice, virtuous, heavily righteous, morally light, ingenuous, honorable, selfless, generous, giving, and innocent. All of his recruits are lawful and guiltless. He is also compliant, obedient and loyal to whoever he thinks his master is (which unfortunately allowed him to be tricked by Big Boss to be his shield, scapegoat and tool whose main function is to die for him and his personal benefit, this is where Solid Snake knew better not to fall for these kinds of traps). In contrast, Big Boss fakes his niceness (in reality, he is mean and cruel), is savage, wicked, sinful, unjustifiable, morally dark (perhaps even amoral), manipulative, dishonorable, disloyal, psychopathic, rebellious, ruthless, selfish, egocentric, cold and calculative. All of his recruits are amoral, criminal, and conniving.
The tape was all about Big Boss convincing The Medic to be his slave. It was never making any inspirational sayings or thoughtful messages towards the player. It was never informing the player that "Big Boss is really a 100% nice, altruistic, benevolent, charitable, giving, kind-hearted, ingenuous, sweet, selfless and good guy and he'll prove it by giving the ability to officially roleplay AND be recognized as Big Boss to you, since you wanted to. Now do him a favor and put that role to good use so that you and him can help change the world, make a mark on history, and finish the story and legend of Big Boss, together". It was to get The Medic to go against his beliefs and do what he wants like the good little doll he is, you're never supposed to actually take anything from it seriously.
It is not a bunch of willy nilly roleplaying meta bullshit where Big Boss is some sort of "meta deity". Don't take any word from the same 3-4 autists that have been circulating Yea Forums for the past week who think otherwise.