I like the overall art style change but in terms of the effects something seems off.
The effects in game seem to be somewhat watered down from how they used to be, for example grenade explosions and plasma explosions seem to just be orange or blue exploding smudges which leave no impact crater and fail to have the effect they did in previous games. For example plasma doesn’t have the electric violent effect as it did before. Also there is no screen shake from grenades from what I could tell.
Also like halo 5 there is no blood visible on the ground, it just seems kinda silly when you AR someone and see blood coming out but none on the floor. Also bullet holes seem to be missing from what I could tell when you shoot a wall.