I've just finished Halo: Combat Evolved from the Halo: Master Chief Collection (Christ almighty, all these modern remasters have such uninspired names), and I dislike it as much as the other time I tried to play it on the Xbone, and before that the original Xbox. I appreciate why it was so well loved, it really did deserve the "Combat Evolved" subtitle, popularising things that we take for granted today (using the butt of a weapon to perform a melee attack? Grenade types outside of infantry in RTS games? Deployables? Vehicles? While many games had done those things before then, I believe it was Halo that refined them.
However, I hate the level design. Again, I know why people love it and find it clever. The way it loads levels up with elevators or corridors. The vast spaces to cover without loading screens are gorgeous, and the remaster is by no means a disservice when it comes to enhancing the visuals and audio of these awe-inspiring zones. But they're a nightmare to navigate without a map, and the rare waypoints are not particularly helpful. It's why I'm so glad Halo 2 and onwards (I've not played 4-Infinite's campaign yet so I can't speak to them) became much more linear, or at the very least clear where you're supposed to go.
The thing is, the corridors and whatnot don't get any easier to navigate, however many times you see the same design. The vast majority of the game is spent in Forerunner complexes, and complex is the word. No matter how many winding staircases or square labyrinths you walk around, there's always some pit, some ramp, some cubbyhole you have to climb through. Add to that conservative checkpoints and very resistant enemies, and it can be a nightmare to recall where you have to go next. I continued playing at times for fear of forgetting where I needed to go the following day.
I look forward to doing the rest of the series in co-op with a mate to get PvE weeklies and as a break from Halo: Infinite's multiplayer. But the only way I'm doing Combat Evolved again is with him taking the lead, and a fully loaded shotgun.