An incredible chore to slog through. What should've been a $15 DLC was inflated by waves of enemies purely for the purpose of extending as much play time as possible. Despite that, I still completed it between breakfast and lunch on a Saturday.
The narrative was practically non-existent for the majority of the game. The last hour summed it up in its entirety and even then it wasn't satisfying. It merely paid homage to the iconic Admiral Keyes and Pillar of Autumn in the form of a prequel. The characters, with their awkward voice acting, weren't given enough development for me to develop any real attachment. Any lore providing collectables were slapdash and incoherent. The levels did have decent architecture, but inside were hollow and lifeless. The janky NPC A.I felt uncomfortable, but at least it remained consistent with the series I suppose. The background soundtrack sounded like it was produced in Garageband and was never meant to be used outside of a phone's ringtone.
The reviews praising this game for anything other than it's character design seem to be from players either experiencing games, or Halo as a franchise, for the first time. This makes sense.