Earlier quoted context omitted.
Halo was an FPS and a spiritual successor to an earlier series of theirs called "Marathon". The main characters, weapons, and themes of the original game all skew very closely to Marathon.
I miss the Bungie that pumped out Marathon, Myth, and Oni. (I will look forward to people who were screaming that console makers mustn't be allowed to buy game authors and studios seamlessly turn a 180 if it favours their tribe.)
Myth and Marathon were experiences in storytelling for me however. I even have a copy of the GURPS Myth roleplaying guide sitting on my bookshelf behind me that goes more into the lore of the Myth universe.