Campaign - 5/10
Fantastic music, but the story was poorly written in my opinion. There were so many missed opportunities to enhance the experience, like formal boss fights. For example, instead of just a cutscene where Chief and Locke duke it out, I would rather play as Chief and incapacitate Osiris, and I would have preferred to have a boss fight against Cortana as Osiris in order to free Blue Team. The new characters were also poorly written as Tanaka and Vale are easily forgettable. They don't have any defining moments throughout the campaign, and even Tanaka's attempt at one was just a cliché "We'll make it through this" speech. On the plus side, there are some returning things that I like, specifically IWHBYD lines and Easter Eggs, but they do not go far enough.
Multiplayer - 8/10
While there are flaws, like the awkward new aiming system and the addition of Spartan Charge, the multiplayer is very well-designed. Arena is well-balanced with regular updates to improve competitive play, but there are still elements that players have been begging for and that have not been addressed, specifically the unhealthy effect of Spartan Charge in the game. Warzone and its variants are also fun and well-designed for more casual players, though Firefight needs some improvements.