Master Chief is the stereotypical "one man, one hope" jock. He's also boring. Even though the guardian is just as quiet, at least you can add your personal touch to the character. The only way you can give your personal touch in Halo is through multiplayer. There is a sense of something bigger in Destiny, in Halo, MC shows up and saved the day. Cortana is a much more interesting character than Master Chief. In fact, the crew from Halo Reach (my favorite Halo hame) was more interesting than Master Chief.