Multiple people on multiple sites have described halo infinite as looking good but kind of flat and slightly off.
This is due to a rather low contrast in game, a slightly too low saturation and a tiny green hue as far as i have figured it out.
By adapting those values (+12% contrast, +3% brightness (so the contrast does not make things to dark), +8% saturation and -1% green brightness) the flatness of the visuals is removed. the things on screen look more distinct, textures better show their details and lighting gets more noticable. The white value also looks a bit more natural.
This is a comparison of an unedited and edited screenshot. a slightly lesser contrast (+10% contrast and +2% brightness instead) might be better to keep the spartans back details visible.