Halo: Cryptum: Book One of the Forerunner Saga is no joke one of my favorite sci fi books. Now... I didn't play the game, but damn if Master Chief didn't lead me to the Didact... and the trilogy of the Forerunners is a favorite pulp fiction sci fi. There's a sense of power, loss, inevitability, and hope...
Halo was farmed out to a lot of authors, but Greg Bear was allowed this trilogy, and he did a great job. Whether you know where it's going or not, this series is a fast read that anyone who likes science fiction can read.
And if you ever get the chance to just watch the original Halo story, do. It's fun pulp sci fi Hail Master Chief. Love Cortana. Respect to the Didact. Thank you Librarian.