Going into what makes Chief human is not getting Chief. I miss when HALO used to be about the plot getting all dark and mysterious, everybody ELSE getting all emotionally compromised and Chief just doing what needs to be done. It's like they forgot they just ripped the T800 off and called him Master Chief. It was perfect. It was the Terminator in the world of Aliens. No useless chatter unless it was to give a one-liner before saving the day.
The moment the question of exploring Chief's humanity in the games came up I immediately became worried, because that isn't why I ever liked Chief and it isn't what Chief ever used to be. For me, trying to delve into his backstory and paint him as human is to have missed the point of his character completely. Keep that stuff in the books.
Chief used to be the modern Duke Nukem and the T800 rolled into one. The gravitas of HALO's story and atmosphere came from absolutely everything else going on around Chief. Other characters were fleshed out. The story would become really dark, the fate of humanity and the galaxy on the brink and then
Rock Anthem for Saving the World would hit your speakers and you knew it was time for Chief to do the only thing Chief knows how to do and the only reason he's part of this story - to kick ass. A lot of that thrill has been sucked out of the HALO games as it's been constantly bogged down with the motive of making a 'deeper', 'more personal' story so the players could feel the stakes of what is going on. Let every other character and exploding city illustrate the stakes and stop ruining my goddamn Chief.