I only miss something from Reach

When you sprint in Reach, the detail from the weapon and environment was unique, sprinting showed a blurry environment which looked realistic, and in Halo 4 it doesnt have it, why was this taken out?

Go sprint outside and tell me if the world blurs around you. Spoiler, it doesn’t. It’s a cheap trick used by video games and movies to give a sense of speed.

You want blur really? Well I guess someone has to like it.

In terms of realism the world doesn’t blur when you sprint, and it certainly wouldn’t blur when being viewed via the advanced optics of armour from the 26th century.

I miss only the grenade launcher, the Ai, Forge World, and Firefight Limited.

IIRC, the sprint in halo reach just overrided the safety limits and ended up wearing out the spartan, which may have been the cause of somewhat impaired vision. This might not be the case with halo 4 sprint.