Despite attempting it many times, I've only managed to finish it once specifically because those options only give you an illusion of choice or straight up make the game worse.How many times did you play it? Have you tried a bunch of different approaches to the giant hangar room in the second mission? Did you make use of the huge variety of branching paths, multitiered areas, and hidden weapon caches? Have you tried loading up your team with heavy weapons, or telling them to snipe, or to cover you with turrets or vehicles? I wonder how much you really explored the options the campaign offered you.
The branching paths don't mean much when the enemies you're sneaking up on aren't capable of surprising you because their AI and the tools at their disposal have been paired down dramatically compared to past Haloes. And that's in the best case scenario, where you're fighting the Covenant. There is absolutely nothing you could do to make fighting Prometheans feel fresh.
The hidden weapon caches break the game's balance. Theoretically "tankier" enemies are a joke if you're always given power weapons that melt them in seconds. You'll never have to do the traditional Halo dance around a Hunter (let alone an Elite, thanks to the forced single player co-op), and the less said about the new cardboard Prom Knights, the better.
Equipping the team with heavy weapons doesn't feel nearly as rewarding as babysitting your fragile marine squad. Both because of their invulnerability and because they never seem to know how to use their power weapons (now with limited ammo).
I really liked my first playthrough (and half of my second run which I had to abort because the Warden fights become the most tedious nightmare if you turn on even the most basic skulls), but ever since then more and more cracks began to show. Halo 5 was a step in the right direction, but they're still miles behind Bungie's design from over 15 years ago.