The Spartans move faster than they did in Halo 2, sprint does not increase the movement speed enough to be noticeable making sprint useless. The base movement speed needs to be brought down to a Halo Reach or even Halo 5 level of speed. The worlds 343 creates will seem smaller and less significant if you can zip around the map just by walking. Smaller maps are too hectic with the player base speeds as they are, and sneaking up behind an enemy is almost impossible, probably why assassinations haven’t made the final cut of the game.