343 have done it again. I don't know how they've managed it but they've retroactively managed to make Halo 4 good in comparison.

I have no idea what happened and pretty much nothing happened in the entire story.
You're thrown out of the airlock of your ship, picked up by a pilot, you find some dead spartans, your pilot is captured, you rescue him and then you fight the final boss who does nothing except hide behind a shield whilst you attack the minions and then the boss loses it's shield. Rinse and Repeat.

Vehicles are absolutely pointless in this game, You won't drive more than 30 seconds without having to abandon your vehicle due to the god awful open world level design. Imagine the level Halo from Halo where you land on Halo and find out what the Halo in Halo is. It's like that but instead of gentle slopes it's nothing but cliffs.

You are given a grapple hook and some other equipment to help traverse the world and once you unlock the second upgrade for the grapple hook (when the game actually lets you, I ran into several menu bugs where I couldn't access the upgrade menu, it was a dice role every time I loaded the game as to whether the menu would actually work, then you have to hope the other bug doesn't occur where you can't change your equipment at all) The second upgrade gives you a reduced cooldown on usage which allows you to scale walls infinitely, making most of the game a case of climbing up a wall and sniping every enemy before moving on.

A new race gets introduced called The Endless and they had about 5 minutes screen time. There are humans on the ring but they don't do anything except sit in the base with their thumbs firmly up their arses.

Every character is 1 dimensional. The Pilot brings up going home every time he opens his mouth, Neo-Cortana doesn't do anything except for say 'this is easy, it'll be done in a second' and then instantly change to 'it's harder than I thought, you're going to need to go push 3 buttons'.

The game ends on a cliffhanger, I think? I honestly couldn't tell.

At this point, I don't know how Microsoft still let 343 make Halo games. Any other company would've shut 343 down by now and given Halo to literally any other developer.