The worst part about this was not that it's bad (because it is not), it's just incredibly disappointing.
Halo Infinite's campaign takes the idea of something like Halo CE's 2nd level and tries to expand on it into a larger, more open area to explore on your own pace, but whereas CE and even the other Bungie games are still fun to revisit due to the carefully crafted pacing and setpieces, Infinite just feels like an absolute slog to get through at times, especially in the latter half, one of the missions for example revolves around going to 4 identical towers with the same layout and pressing a button, it's not exciting or memorable in the least, the plot being basically non-existent and resolving many of 5's plot threads off-screen (because for some reason they still think most fans go out of their way to read the books and comics) doesn't help. Even if the gameplay and movement is really solid and a step in the right direction, the level design feels the most dull and repetitive the series has ever felt, there's really nothing in this campaign that sticks out in my mind as truly impressive, it's just consistently "okay" or boring. Compared to something like 4 or 5 it's hard to blame 343i entirely for this because this is clearly a rushed project that hit tons of roadblocks during development due to how the company itself is structured (only hiring temporary contractors), countless directors leaving and having to switch engines already years into development but it's a shame that the one time it felt like they could deliver something on par with the older titles, they came out with this instead because of poor project and company management.