This game had a lot of weird plot twists. I saw parts of a playthrough done by Achievement Hunter (years before they disbanded). I was surprised that Cortana became the main villain. She also sent Earth back to the Stone Age by destroying its computers. There was also a series of downloadable missions involving former Red vs Blue cast members. They were funny easter eggs of a better time for the internet.
I remember watching Red vs. Blue in the early days. They were quite entertaining back then. Kind of a shame Rooster Teeth (the company behind that series) is shutting down.