from hit detection, incoming and outgoing,
all the way to on screen detection of incoming damage.
Its kinda infuriating to not feel any vibration when you take damage but when you're downed you can feel footsteps from enemies and teammates in fine detail.

The field of view needs an adjustment also,
The enemies look tiny as fuck at midrange.
You cant pull off a headshot like you would be able to in Destiny
because the enemy design is kinda trash and the field of view may be sligtly too far.