not sure if anyone else agrees but the halo 5 art style was good but it lacked the gritty, wear and tear details. The universe did not look lived in at all.
There is a lot to be learnt without having to doing much cheesey dialogue and paying for expensive actors just by getting the art style and mood right.
Great example would be this: http://youtu.be/6inRzSSnClw
343 make a lived in universe with the wear and tear and GRIT to create a more believable universe such as the one above.